Book summary “Foundations of nursing research”: summary

Introduction

You often face clinical decisions based on tradition rather than solid evidence. This reliance on custom leaves patient care vulnerable to outdated methods and unproven assumptions. You need a reliable way to build a distinct body of knowledge that guides professional practice and proves your clinical value.

Nursing research provides the systematic evidence required to guide clinical practice, ensure accountability, and prove the cost-effectiveness of nursing care.

Rose Marie Nieswiadomy maps the entire research process from initial problem identification to final utilization. You will learn how to design quantitative and qualitative studies, protect human subjects, and evaluate published literature.

As you read, you will find answers to several core questions:

• How does nursing research differ from other scientific investigations?
• What steps ensure ethical protection for vulnerable human subjects?
• How do you appraise quantitative and qualitative study results?
• Which strategies turn research findings into daily bedside practice?

1. Development of Nursing Research

Nursing research is a systematic and objective process of analyzing phenomena of importance to nursing practice, education, and administration. You rely on research to build a unique body of knowledge that guides clinical decisions.

Nursing research has evolved from traditional reliance on custom and authority to a rigorous scientific process aimed at building a unique body of knowledge for clinical practice.

Importance of Research to Nursing

You historically relied on non-scientific sources before adopting empirical data. These traditional sources shape daily routines without systematic testing:

• tradition passes knowledge down through generations via practices that lack scientific support;
• authority relies on experts, historically including physicians;
• trial and error uses solutions until something works without analyzing underlying reasons.

Scientific research replaces these methods with systematic, empirical data gathered through the senses under strict control.

Kawakami et al. conducted a basic research study examining how syringe pump settings, flow rates, and syringe sizes affect bolus amounts and occlusion alarms. They tested 10 ml or 50 ml plastic syringes with a 100 cm extension tube at initial infusion rates of 3 ml or 10 ml per hour.

Goals for Conducting Nursing Research

Basic research seeks knowledge for its own sake and often takes years to see social usefulness, sometimes using laboratory animals. Applied research focuses on addressing issues directly within nursing practice and forms the majority of nursing studies.

The primary goals for conducting nursing research are promoting evidence-based practice, ensuring professional credibility, providing accountability, and proving cost-effectiveness.

Brooten et al. examined early hospital discharge and home follow-up care of very-low-birth-weight infants in a 1986 study, proving that nurse specialist care is safe, reduces iatrogenic illness, and cuts hospital costs.

Quantitative and Qualitative Research

Quantitative research focuses on objectivity, tight controls, and numerical data for generalization. Qualitative research explores the subjective meaning of human experiences using narrative formats.

For chronic pain, quantitative research measures pain levels and how to reduce them, while qualitative research investigates what it means to live with chronic pain.

2. Evidence-Based Nursing Practice

Evidence-based practice integrates rigorous research evidence, clinical expertise, and patient values to elevate care quality and meet healthcare accreditation standards.

Archie Cochrane published his seminal book in 1972 pointing out the lack of solid evidence in healthcare and establishing randomized controlled trials as the gold standard. Sackett et al. further defined evidence-based medicine in 1996, which later expanded to incorporate clinical expertise and patient values in nursing definitions. You apply evidence-based practice to address escalating healthcare costs and demands for accountability in safety and quality improvement. The Joint Commission and the American Nurses Credentialing Center recognize EBP as the standard of care for maintaining accreditation and achieving Magnet Hospital recognition. Every 3 years, 20,500 healthcare organizations and programs accredited by The Joint Commission undergo on-site reviews.

Defining Evidence-Based Practice

Research utilization focuses narrowly on applying specific research study findings to practice, whereas evidence-based practice is a broader approach incorporating evidence, clinician expertise, patient preferences, and local outcomes. The CURN project demonstrated early federally funded efforts to move nurses away from custom and authority toward research findings like maintaining closed urinary systems. You structure clinical questions in EBP using the PICOT format to systematically guide literature searches and address patient or organizational problems:

• Identify the population of interest (P)
• Define the intervention of interest (I)
• Establish the comparison intervention (C)
• Determine the desired outcome (O)
• Specify the time frame (T)

Hain and Kear used PICOT to assess adults with chronic kidney disease, questioning how an exercise program compared to no exercise program affects regular exercise participation within a 3 months time frame. The international nonprofit Cochrane Collaboration, established in 1993 and named after Archie Cochrane, includes 53 Cochrane Review Groups publishing systematic reviews via the Cochrane Library, which consists of 6 databases. As of May 2015, the Cochrane Database contained 6,300 reviews and 2,400 protocols contributed by authors across 120 countries. Gillespie et al. reviewed 159 clinical trials with 79,193 participants in the community falls study and found that group and home-based balance and strength training programs effectively reduced falls in older adults.

The Agency for Healthcare Research and Quality operates under the Department of Health and Human Services with a $465,004 million budget in 2015, delivering the National Quality Strategy to Congress. Its funded Evidence-Based Practice Centers numbered 13 in May 2014 and generate evidence reports, which the independent U.S. Preventive Services Task Force uses to grade clinical preventive services. The National Guideline Clearinghouse contained 2,401 summaries of guidelines in May 2015. The USPSTF fourth annual report in 2014 identified high-priority evidence gaps related to the care of children and adolescents. You apply USPSTF clinical preventive services recommendations based on specific grades:

• Grade A: Recommend the service with high certainty of substantial net benefit
• Grade B: Recommend the service with high certainty or moderate certainty of moderate to substantial net benefit
• Grade C: Recommend the service with at least moderate certainty of small net benefit
• Grade D: Recommend against the service with certainty of no net benefit or outweighing harms
• Grade I: Conclude current evidence is insufficient to assess balance of benefits and harms

Dedicated nursing research and EBP centers internationally promote the synthesis and translation of evidence into clinical nursing actions. The Joanna Briggs Institute was established in 1996, building on the legacy of Joanna Briggs who lived from 1805 to 1880, and now coordinates 70 entities collaborating internationally with 3 collaborating JBI nursing centers in the United States. The Joanna Briggs Institute published a best practice recommendation on blood pressure and sodium chloride intake noting that salt reduction decreases blood pressure especially in hypertensive individuals. The ACE Center for Advancing Clinical Excellence was established in 2000, joining the Sarah Cole Hirsh Institute in synthesizing research, consulting across settings, and offering certificate programs.

Models to Promote Evidence-Based Practice

Implementation models like the Stetler Model and the Iowa Model provide structured frameworks for integrating research evidence and quality improvement into clinical agencies.

The Stetler Model guides individual or institutional research utilization through 5 phases:

• Stetler Model Phase 1: Preparation
• Stetler Model Phase 2: Validation
• Stetler Model Phase 3: Comparative evaluation and decision making
• Stetler Model Phase 4: Translation and application
• Stetler Model Phase 5: Evaluation

The Iowa Model guides agency-wide EBP protocols using problem-focused or knowledge-focused triggers through 7 steps:

• Iowa Model Step 1: Identify problem-focused or knowledge-focused triggers
• Iowa Model Step 2: Form a team
• Iowa Model Step 3: Assemble, synthesize, and critique research
• Iowa Model Step 4: Pilot the new practice
• Iowa Model Step 5: Evaluate structure, processes, and outcomes
• Iowa Model Step 6: Disseminate results
• Iowa Model Step 7: Return to triggers for revision

Harris utilized a CDC care bundle to reduce catheter-associated urinary tract infections by combining toileting dependent patients every two hours, justifying catheter insertion, and maintaining aseptic insertion techniques.

Barriers and Facilitators

Effective implementation of EBP faces organizational and individual barriers that must be overcome using structured facilitation strategies and leadership support. Common barriers include lack of time, heavy workloads, unsupportive management, scarce resources, and resistance to change. Facilitation requires leadership support, nurse champions, mentors, EBP councils, accessible librarian resources, journal clubs, and academic-practice partnerships. A nurse reviewed American Society for Parental and Enteral Nutrition guidelines at the end of a staff meeting, leading to a knowledge-based trigger and a hospital-wide policy change. You can utilize proven facilitation strategies in your clinical setting:

• Support and encourage EBP projects from leadership
• Sponsor relationships with mentors possessing EBP skills
• Promote use of computer-based best practice guidelines at the point of care
• Implement evidence-based clinical policies and procedures
• Establish journal clubs

3. Ethical Issues in Nursing Research

Human subjects in nursing research must be protected through institutional review boards, voluntary informed consent, and adherence to strict ethical codes.

Development of Ethical Codes

Atrocious human experimentation during World War II and in the United States exposed severe violations of human rights and motivated modern research ethics codes. Unethical historical events include Nazi concentration camp experiments, Japanese biological warfare human subjects in Unit 731, the Tuskegee Study of Untreated Syphilis, the Willowbrook hepatitis study on mentally retarded children, and live cancer cell injections at the Jewish Chronic Disease Hospital.

In the Tuskegee Study begun in 1932 by the U.S. Public Health Service, 399 black men with syphilis were left untreated despite penicillin becoming the treatment of choice in 1945. Modern research ethics are governed by foundational international codes and federal regulations that mandate subject protection, institutional review, and inclusion of women and minorities.

Institutional Review Boards

Institutional Review Boards are administrative bodies mandated by federal policy to review, approve, and oversee research involving human subjects to protect their rights and welfare. Federal regulations require IRBs to consist of at least five members with diverse backgrounds, including representation from both scientific and nonscientific areas, and at least one member unaffiliated with the institution. You must submit your research protocol for exempt, expedited, or full review depending on study risks.

Elements of Informed Consent

Informed consent is the primary means of ensuring the protection of research participants, requiring a full understanding of the study before participation begins. The consent process involves explaining the study purpose, procedures, duration, foreseeable risks, potential benefits, alternative procedures, confidentiality maintenance, handling of injuries, contact information, and the absolute freedom to withdraw without penalty.

You must meet specific requirements when conducting studies involving human participants:

• Ensure subjects are informed about the study
• Ensure research is for the good of society
• Precede human research with animal research if possible
• Avoid injury to research subjects
• Ensure the researcher is qualified
• Allow subjects or researchers to stop the study if problems occur

4. Quantitative and Qualitative Research

Quantitative research utilizes objective numeric measurement and control, whereas qualitative research explores holistic human experiences through narrative insights.

Comparison of Research Approaches

Quantitative research relies on manipulation, control, and objective data collection across large random samples. Qualitative research observes and describes natural phenomena using small, deliberately selected samples and narrative data.

Researchers systematically observed social spaces and abandoned cars to build a qualitative theory on neighborhood crime, later expanding to quantitative assessments using large-scale digital records.

• Select quantitative methods when testing variables, utilizing control, and measuring numerical data
• Select qualitative methods when exploring poorly understood phenomena to gather rich, deep descriptive narratives

Steps in Quantitative Research

The quantitative research process proceeds through a structured, sequential series of nineteen ordered steps from problem identification to utilization of findings.

A researcher observing intraoperative chilling in surgical patients narrows down the broad problem area of intraoperative hypothermia to specific warming interventions.

• Identify the research problem
• Determine the purpose of the study
• Formulate the research question
• Review the literature
• Develop a theoretical/conceptual framework
• Identify the study assumptions
• Acknowledge the limitations of the study
• Formulate the hypothesis
• Define the study variables/terms
• Select the research design
• Identify the population
• Select the sample
• Conduct a pilot study
• Collect the data
• Organize the data for analysis
• Analyze the data
• Interpret the findings
• Communicate the findings
• Utilize the findings

Qualitative Research Methods

Qualitative research focuses on the individual and holistic human experience rather than groups, making it consistent with traditional nursing values.

• Identify the problem of the study
• State the purpose
• Select the research design
• Review the literature
• Select the sample
• Gain entry to the research site
• Protect the rights of participants
• Collect the data
• Analyze the data
• Interpret the data
• Communicate the study results

5. Problem Identification and Literature Review

Rigorous research begins with a clear problem statement and a comprehensive literature review that establishes existing knowledge gaps and theoretical foundations.

Nursing research problems are primarily generated from personal experiences, literature sources, existing theories, and previous research. Kern (2014) replicated a previous single-site study by Jeffreys (2007) using a 27-item survey to assess self-perceptions related to student retention in an RN-to-BSN program. Choosing a research topic requires evaluating ethical issues, clinical significance, researcher qualifications, personal motivation, and study feasibility.

Identifying Nursing Research Problems

A well-constructed research question must be written in interrogative form, include the target population, specify variables, and be empirically testable. Research questions examining multiple variables are structured neutrally as either correlational or comparative statements. Evaluating a published research report begins by locating and critiquing the clarity, context, and scope of its problem statement, purpose, and questions. You must check feasibility by practical assessments:

• Determine what equipment will be needed
• Confirm if the equipment is available and in proper working order
• Verify if there is a qualified operator of the equipment
• Check if necessary supplies are available or obtainable

Review of the Literature

A comprehensive literature review establishes existing knowledge, helps frame theoretical perspectives, and guides research methodology. Literature sources consist of primary research accounts, secondary summaries, and essential grey literature that helps prevent publication bias.

Search Strategies

Effective literature searching requires pre-search planning, starting with a concise research question and expanding keywords to generate manageable, relevant results. Hamilton and Restrepo combined terms like childbirth and research with the phrase time factors, limited to academic journals with references, to find studies on weekend births and neonatal mortality between 2010 and 2015, referencing their 2006 work in JOGNN. Librarians possess specialized expertise that can optimize literature searches and support research teams throughout the entire project lifecycle, as Lisa Federer noted in 2013. Finding tools such as library catalogs, electronic databases like CINAHL starting in 1982 and MEDLINE starting in 1949, and search engines are essential for indexing and retrieving literature sources. A comprehensive literature review involves analyzing individual sources and synthesizing their findings to build a data-based foundation for a research argument.

6. Theory and Hypotheses in Research

Theories provide abstract conceptual frameworks for research, while declarative hypotheses predict specific relationships between study variables.

Kerlinger defined a theory in 1973 as a set of interrelated constructs, definitions, and propositions specifying relations among variables to explain and predict phenomena. Polit and Beck provided a similar definition in 2012. You use theories as systematic, abstract explanations composed of interconnected concepts, propositional statements, empirical generalizations, and models.

Theory Terminology and Scope

Nursing theories span a hierarchy from broad philosophical paradigms to focused practice theories. Grand theories address broad phenomena and remain highly abstract. Middle-range theories focus on smaller areas to bridge the theory-practice gap. Practice theories provide specific clinical guidance for precise patient care situations.

Hatfield used Melzack and Wall's gate control theory of pain, published in 1983, to study sucrose use in decreasing infant biobehavioral responses to immunizations. Bandura's self-efficacy theory was published in 1985 and is utilized in nursing simulation studies. Farren used Rogers's Science of Unitary Human Beings to study relationships among power, uncertainty, self-transcendence, and quality of life in breast cancer survivors. A 2000 article in Nursing Science Quarterly identified 66 studies using Orem's theories.

Integrating Theory into Research

Theoretical development and reasoning involve both deductive and inductive processes. In deduction, a theory leads to propositional statements and hypotheses tested against empirical data. Testing a propositional statement from Maslow's theory of motivation regarding safety needs taking precedence over self-esteem needs serves as an example. Induction moves from specific empirical observations to general theory.

Rigorous theory testing in nursing research requires a systematic application of the framework:

• Review various theories that may be appropriate to examine the identified problem.
• Select a theory to be tested in the study.
• Review the literature on this theory.
• Develop study hypothesis(es) or research questions based on a propositional statement or statements from the theory.
• Define study variables, using the selected theory as the basis of the theoretical definitions.
• Choose study instruments that are congruent with the theory.
• Describe study findings in light of the explanations provided by the theory.
• Relate study conclusions to the theory.
• Determine support for the theory based on study findings.
• Determine implications for nursing based on the explanatory power of the theory.
• Make recommendations for future research concerning the designated theory.

Developing Hypotheses

Quantitative studies utilize hypotheses as intelligent, conjectural statements of predicted relationships between independent and dependent variables. You classify hypotheses along several dimensions:

• Simple hypotheses involve one independent and one dependent variable, whereas complex hypotheses involve multiple variables.
• Directional research hypotheses predict the specific nature of the relationship, while nondirectional research hypotheses state only that a relationship exists.
• Causal research hypotheses require experimental designs, whereas associative research hypotheses rely on nonexperimental designs.
• Research hypotheses contrast with statistical null hypotheses, where the usual level of significance set in nursing for rejection is 0.05.

Patrick et al. tested a hypothesis in 2016 that changes in cigarette taxes and prices over time associated with an overall decrease in infant mortality. A 1 dollar increase in cigarette tax per pack was associated with infant mortality decreasing by -0.19 per 1000 live births. Ho et al. tested a causal hypothesis in 2016 predicting that swaddling preterm infants prior to a heelstick procedure would result in decreased pain compared to unswaddled infants.

Well-constructed research hypotheses must meet specific criteria:

• Be written in a declarative sentence.
• Be written in the present tense.
• Contain the population.
• Contain the variables.
• Reflect the problem statement, purpose statement, or research question.
• Be empirically testable.

7. Research Designs

Quantitative designs range from true experiments ensuring causality to descriptive nonexperimental studies, complemented by qualitative and mixed methods designs.

Quantitative studies fall into three levels based on existing knowledge:

• Exploratory studies investigate little-known phenomena using flexible data collection.
• Descriptive studies examine existing relationships and test hypotheses.
• Explanatory studies control conditions to search for causal explanations.

Quantitative Research Designs

True experimental designs provide the greatest control and permit confident inferences of causality. You need manipulation of the independent variable, at least one comparison group, and random assignment to eliminate selection bias.

Fitzgerald, Rorie, and Salem (2015) used a pretest-posttest design with 169 prelicensure master's entry clinical nursing students to evaluate the acceptability of a mobile health application. Quasi-experimental designs use intact groups without random assignment, while pre-experimental designs offer minimal control and fail to address threats to internal validity.

Nonexperimental research describes existing phenomena without variable manipulation when ethical constraints prevent experimentation. Chen, Chen, and Chu (2015) conducted a correlational study in Taiwan examining caregiver burden, health status, and learned resourcefulness among 12 older caregivers.

Experimental designs must account for internal validity threats and external validity factors like the Hawthorne effect.

Key threats to internal validity include selection bias, history events, subject maturation, testing effects, instrumentation changes, and differential mortality. External validity concerns generalizability and is threatened by the Hawthorne effect, experimenter effects, and reactive pretest effects. Hagel et al. (2015) quantified the Hawthorne effect by showing that healthcare workers performed hand hygiene at an almost 3 to 1 ratio of hand hygiene performance under direct supervision compared to electronic recording.

Qualitative and Mixed Methods Designs

Qualitative approaches explore lived meanings and cultural contexts. Fritz (2015) used a grounded theory method with 10 low-income women with type 2 diabetes to develop the Transactional Model of Diabetes Self-Management Integration.

Mixed methods research intentionally integrates quantitative and qualitative approaches. Researchers deploy six primary strategies:

• sequential explanatory;
• sequential exploratory;
• sequential transformative;
• concurrent triangulation;
• concurrent nested;
• concurrent transformative.

8. Populations, Sampling, and Measurement

Quantitative sampling aims to draw representative subsets from a larger group so that valid generalizations can be made back to the population. You divide the research population into a target population and an accessible population.

Valid generalizations require representative population sampling, precise measurement scales, and reliable, valid data-collection instruments.

Adams, Koop, Quan, and Norris (2015) studied length of stay and costs for older adults. They established a target population of individuals 65 and older admitted to acute care hospitals and an accessible population of 12,283 eligible participants.

Populations and Samples

An entire population is generally not used due to time, money, and access limitations. A single member is an element, selected from a sampling frame listing all population elements.

Probability sampling relies on systematic, scientific random selection processes to obtain representative population elements. Nonprobability sampling uses nonrandom methods based on convenience, quota, or purposive selection, which restricts generalizability. Poreddi et al. (2016) used a convenience sample of 172 nursing students to examine knowledge and attitudes regarding child abuse and neglect.

Measurement and Data Collection

Measurement assigns numbers to variables and is classified into four distinct levels: nominal, ordinal, interval, and ratio. You must answer the five WWWWH questions before collecting data:

• Ask the five WWWWH questions: Who will collect the data?
• Determine when the data will be collected, including month, day, hour, and duration.
• Determine where the data will be collected under optimum conditions.
• Decide what data will be collected based on research questions.
• Determine how the data will be collected using an appropriate research instrument.

Reliability and Validity

Reliability measures consistency and stability, and you should generally avoid instruments with reliability coefficients lower than .70. Validity evaluates the ability of an instrument to accurately capture the specific data or construct it was designed to measure.

9. Data Collection Methods and Statistics

Data collection utilizes questionnaires, interviews, observations, and physiological measures, which are then analyzed using descriptive and inferential statistics.

Data Collection Methods

Errors stem from instrument inadequacies, administration biases, environmental variations, and transitory personal factors. Questionnaires require careful reading levels and neutral wording.

Eltorai et al. (2015) found that online patient-education materials from the American Academy of Orthopedic Surgeons had a mean readability level of grade 9.2, exceeding average U.S. adult literacy.

• State questions in an affirmative rather than a negative manner.
• Avoid ambiguous words like many, usually, few, often, large, several, and generally.
• Avoid double negative questions.
• Ensure questions contain neutral wording.
• Avoid double-barreled questions containing and.

Interviews offer high response rates but risk the Rosenthal effect. Observation research balances concealment with client welfare.

Descriptive Statistics

The normal curve forms the statistical foundation with identical mean, median, and mode values.

• 68.26 percent: proportion of the distribution lying within plus or minus 1 standard deviation from the mean
• 95.44 percent: proportion of the distribution lying within plus or minus 2 standard deviations
• 99.72 percent: proportion of the distribution lying within plus or minus 3 standard deviations
• 30: minimum sample size threshold to closely approximate the normal curve

Inferential Statistics

Inferential statistics test hypotheses and estimate population parameters using probability laws.

• State the study hypothesis (generally, a directional research hypothesis).
• Choose the appropriate statistical test.
• Decide on the level of significance (alpha level).
• Decide if a one-tailed or two-tailed test will be used.
• Calculate the test statistic, using the research data.
• Compare the calculated value to the critical value for that particular statistical test.
• Reject or fail to reject the null hypothesis.
• Determine support or lack of support for the research hypothesis.

10. Communication, Economics, and Critique

Communicating findings, utilizing research in practice, demonstrating healthcare economic value, and critiquing reports complete the research cycle.

Communication of Research Findings

Research findings must be presented objectively in both narrative form and tables without researcher opinions, reporting exact probability values and test statistics.

• Present findings in both a narrative form and in tables.
• Ensure tables appear as soon as possible after they are mentioned in the text.
• Ensure information presented in tables is also discussed in the narrative.
• Use clear, concise table titles without including the name of the statistical test.
• Round all data entries to the same number of decimal places.
• Line up decimal points under each other in data columns.
• Enter a dash instead of leaving a blank space if data are missing.

Healthcare Economics and Nursing

Quantifying the economic value of professional nursing demonstrates that higher registered nurse staffing levels significantly reduce patient complications and hospital length of stay.

Dall et al. estimated that adding 133,000 full-time equivalent RNs to U.S. acute care hospitals would save 5,900 lives per year and yield an economic value of $57,700 per additional RN.

Critique of Research Reports

Evaluating a quantitative research report requires a systematic assessment of its components, beginning with a cursory review of the entire article followed by an in-depth evaluation of each structural section.

• Begin with the abstract and introductory section.
• Examine the study design in the methods section and check if other parts of the study are congruent with it.
• Evaluate the researcher qualifications and credentials.
• Check the title for clarity, conciseness, and inclusion of keywords.
• Review the introduction and specific problem statement, purpose, or research question.
• Assess the literature review for primary sources, classic and current references, and logical flow.
• Identify explicit and implicit assumptions made by the researcher.
• Determine if limitations are openly stated.
• Examine the hypotheses for declarative structure, testability, and single predictions.
• Review operational definitions of key terms.
• Evaluate the research design, setting, population, and sampling methods.
• Apply the WWWWH acronym to the data collection section.
• Check the reliability and validity of data-collection instruments.
• Analyze whether descriptive and inferential statistics are correctly presented and interpreted.
• Assess conclusions, clinical versus statistical significance, implications, and recommendations.

10 Key Ideas

1. Nursing research provides the systematic evidence required to guide clinical practice, ensure accountability, and prove the cost-effectiveness of nursing care.
2. Evidence-based practice integrates rigorous research evidence, clinical expertise, and patient values to elevate care quality and meet healthcare accreditation standards.
3. Human subjects in nursing research must be protected through institutional review boards, voluntary informed consent, and adherence to strict ethical codes.
4. Quantitative research utilizes objective numeric measurement and control, whereas qualitative research explores holistic human experiences through narrative insights.
5. Rigorous research begins with a clear problem statement and a comprehensive literature review that establishes existing knowledge gaps and theoretical foundations.
6. Theories provide abstract conceptual frameworks for research, while declarative hypotheses predict specific relationships between study variables.
7. Quantitative designs range from true experiments ensuring causality to descriptive nonexperimental studies, complemented by qualitative and mixed methods designs.
8. Valid generalizations require representative population sampling, precise measurement scales, and reliable, valid data-collection instruments.
9. Data collection utilizes questionnaires, interviews, observations, and physiological measures, which are then analyzed using descriptive and inferential statistics.
10. Communicating findings, utilizing research in practice, demonstrating healthcare economic value, and critiquing reports complete the research cycle.