HESI Nursing Research Exam

Correct answer: A. It is a null hypothesis.

Explanation of the correct answer:

A. It is a null hypothesis.

A statistical hypothesis typically refers to a null hypothesis (denoted as H₀), which is a statement that assumes no effect or no relationship between variables. In hypothesis testing, the null hypothesis serves as the default assumption that any observed differences or relationships are due to chance, rather than a true effect. Researchers test the null hypothesis against an alternative hypothesis (H₁), which suggests that a relationship or effect does exist. Therefore, the null hypothesis is a central concept in statistical hypothesis testing.

Why the other options are incorrect:

B. It predicts a positive relationship among variables.

While some hypotheses may predict a positive relationship between variables, a statistical hypothesis does not always predict a positive or specific relationship. A null hypothesis, for example, assumes that there is no relationship or effect. An alternative hypothesis may predict a positive, negative, or no specific relationship at all, depending on the research question. Hence, this is not a defining characteristic of a statistical hypothesis.

C. It is a complex hypothesis.

A statistical hypothesis is typically simple and focused on testing the relationship or effect between two variables (in the case of a null hypothesis, typically assuming no effect). Complex hypotheses may involve multiple variables or more intricate relationships, but statistical hypotheses do not inherently need to be complex. Thus, this option is not correct.

D. It describes data-analysis methods.

A statistical hypothesis does not describe how data will be analyzed. Rather, it states the assumption to be tested about the relationship between variables. The methods for analyzing the data, such as t-tests, ANOVA, or regression analysis, are separate from the formulation of the hypothesis itself.

Summary:

A statistical hypothesis, particularly in hypothesis testing, is often a null hypothesis (H₀) that assumes no relationship or effect between variables. Researchers test this hypothesis against an alternative hypothesis (H₁), and statistical methods are used to evaluate the evidence supporting or rejecting the null hypothesis.

Correct answer: C. Analysis understanding

Explanation of the correct answer: C. Analysis understanding

When a nurse is critically reading a research study and writing cues, the relationships of concepts, and questions on a photocopy version of the study, this is part of the analysis phase of critical reading. In this phase, the reader carefully examines the content to understand how the various components of the study are connected. It involves questioning the study's methods, findings, and conclusions, identifying the relationships between concepts, and making sense of the study's logic and structure. The nurse is essentially breaking down the study into its individual elements and scrutinizing the data, concepts, and conclusions to evaluate its validity and relevance.

Why the other options are incorrect:

A. Preliminary understanding

The preliminary understanding stage occurs at the beginning of the reading process. In this stage, the reader typically skims the study for an overview, getting a general sense of the content, research question, and study purpose. Writing cues or analyzing the relationships of concepts would go beyond this initial, broad understanding.

B. Comprehensive understanding

Comprehensive understanding involves a deeper reading of the study to fully grasp the research design, methods, and findings. While this stage builds on the preliminary understanding, it is still more about understanding the entire study in depth rather than focusing specifically on analyzing the details and relationships of concepts.

D. Synthesis understanding

Synthesis understanding occurs when the reader integrates the information from the study with other relevant research, knowledge, or experience to form a broader, more comprehensive understanding. The process described in the question is more about analyzing the study in isolation rather than synthesizing it with external knowledge or perspectives.

Summary:

The process of writing cues, identifying relationships of concepts, and asking questions about the study is best described as analysis understanding. This stage is where the reader critically examines and breaks down the study’s components, making connections and questioning the research's methods and findings.

Correct answer: C. The study was approved by an institutional review board.

Explanation of the correct answer:

C. The study was approved by an institutional review board (IRB)

The institutional review board (IRB) is responsible for ensuring that research involving human participants adheres to ethical standards. This includes ensuring that participants' rights are protected, informed consent is obtained, and risks are minimized. Approval from the IRB is a key indicator that the research has been reviewed and deemed to meet ethical guidelines. The IRB is tasked with overseeing the ethical aspects of a study, and their approval is essential for ensuring that ethical standards are met.

Why the other options are incorrect:

A. The reliability and validity of each measure were discussed

While discussing the reliability and validity of the measures is important for ensuring the quality and accuracy of the research instruments, it does not directly speak to whether the study has met ethical standards. Ethical standards primarily focus on the protection of participants, informed consent, and minimizing harm, rather than the technical quality of the measures.

B. The data analysis procedures are thoroughly discussed

While the data analysis procedures are important for understanding how the data were handled and ensuring the scientific rigor of the study, they do not address whether the research adhered to ethical principles. Ethical considerations involve how participants are treated, which is not directly related to the analysis procedures.

D. The sampling techniques used were discussed

Discussing the sampling techniques is important for the validity and generalizability of the study findings, but it does not directly address ethical standards. Ethical standards focus on how participants are selected, treated, and protected during the study, rather than on the techniques used to sample them.

Summary:

The institutional review board (IRB) approval is the best indicator that a research study has met ethical standards, as the IRB ensures the protection of participants and that the study adheres to ethical guidelines before it begins.

Correct answer: C. Absence of lung cancer

Explanation of the correct answer:

C. Absence of lung cancer

In an ex post facto study, the dependent variable refers to the outcome that researchers are studying in relation to the independent variable. In this case, the independent variable is cigarette smoking, and the study compares smokers to nonsmokers. For the control group (nonsmokers), the focus is on the absence of lung cancer because nonsmokers are not exposed to the independent variable (smoking) and, therefore, the study would observe the absence of lung cancer in this group.

The control group, by definition, serves as a baseline for comparison, and in this case, nonsmokers would typically not have the exposure to cigarette smoke, and thus, the study may observe the absence of lung cancer as an outcome.

Why the other options are incorrect:

A. Cigarette smoking

Cigarette smoking is the independent variable in the study, not the dependent variable. The independent variable is the factor that is being manipulated or categorized (in this case, smoking vs. nonsmoking), while the dependent variable is the outcome being measured (lung cancer or the absence thereof).

B. Lung cancer

While lung cancer is the primary outcome being studied, it would be the dependent variable for both groups (smokers and nonsmokers). However, in the context of the control group (nonsmokers), the study would be observing the absence of lung cancer, as nonsmokers would not be exposed to the risk factor (smoking) being studied.

D. Lack of cigarette smoking

The lack of cigarette smoking refers to the condition of the control group (nonsmokers) but does not describe the dependent variable. The focus of the study is on the relationship between smoking and the outcome of lung cancer, so the dependent variable for the control group is the absence of lung cancer, not the lack of smoking itself.

Summary:

For the control group (nonsmokers) in an ex post facto study, the dependent variable is the C. Absence of lung cancer, as the study is observing the outcome (lung cancer) in individuals who are not exposed to the independent variable (cigarette smoking). The other options refer to either the independent variable or the general outcome, but not specifically to the absence of the condition in the control group.

Correct answer: B. The research method that best meets the intended purpose of the study should be used.

Explanation of the correct answer:

B. The research method that best meets the intended purpose of the study should be used.

A nurse researcher should understand the philosophy underlying each type of research because this understanding helps in selecting the most appropriate research method for the study's intended purpose. Different research paradigms (such as qualitative or quantitative) have distinct philosophies and approaches, and the chosen method must align with the research question and objectives to ensure that the study is conducted effectively and produces valid results. For instance, a study exploring lived experiences may require qualitative methods, while a study testing hypotheses about cause and effect may require quantitative methods. Understanding these underlying philosophies helps researchers make informed decisions about which method will best address the research question.

Why the other options are incorrect:

A. Conclusions reached should be congruent with the research question.

While this is an important aspect of research design, it is not the primary reason why understanding the philosophy of each type of research is important. It is true that conclusions must align with the research question, but understanding the research philosophy helps in selecting the right method, not just ensuring congruence between the conclusion and the question.

C. The reader should understand the level of abstraction of the study.

Understanding the level of abstraction is useful in interpreting the study, but it is not the main reason a nurse researcher should understand the philosophy underlying the research. The primary reason is to choose the most appropriate research method for the study's purpose, not simply to explain the study's abstraction level.

D. The paradigm of the method should be the same as that of the researcher.

While it is important for a researcher to be comfortable with the paradigm they are working in, the research method should be chosen based on the study's purpose rather than the researcher's personal paradigm. A researcher might adopt a method from a different paradigm if it best suits the research question.

Summary:

Understanding the philosophy behind different types of research allows a nurse researcher to choose the research method that best fits the purpose and objectives of the study. This ensures that the study is methodologically sound and capable of addressing the research question effectively.

Correct answer: B. Inductive, D. Descriptive

Explanation of the correct answers:

B. Inductive

Qualitative research commonly follows an inductive reasoning process, which means it builds general theories or patterns from specific observations or data. Rather than starting with a hypothesis, researchers gather rich, detailed information and allow themes and concepts to emerge from the data. This bottom-up approach is a hallmark of qualitative methodologies.

D. Descriptive

Qualitative research is often descriptive in nature, aiming to provide an in-depth understanding of human behavior, experiences, and social phenomena. It explores the what, how, and why of a topic, often using detailed narrative descriptions and thematic analysis rather than statistics.

Why the other options are incorrect:

A. Numerical

This describes quantitative research, not qualitative. Qualitative research focuses on words, meanings, and experiences, while quantitative research emphasizes numbers, measurements, and statistical analysis. Therefore, qualitative research is non-numerical by nature.

C. Explanatory

Although qualitative research can explore why certain behaviors or experiences occur, the term “explanatory” more specifically refers to quantitative designs that seek to identify cause-and-effect relationships. Qualitative research is more about exploration and description than explanation in a causal sense.

Summary:

Qualitative research is best described as inductive and descriptive, as it seeks to understand complex human experiences through open-ended, detailed data collection and analysis. It is not numerical or strictly explanatory in the cause-and-effect sense. The correct answers are B and D.

Correct answers: A, C

Explanation of the correct answers:

A. Test-retest reliability

Test-retest reliability is a method used to assess the stability of an instrument over time. It involves administering the same test to the same group of people at two different points in time and then comparing the results. High correlation between the two sets of results suggests that the instrument is stable and reliable over time.

C. Parallel reliability

Parallel reliability, also known as parallel forms reliability, refers to the stability of an instrument when different forms of the test (that are designed to be equivalent) are administered to the same group. This test checks whether different versions of the same instrument produce consistent results, reflecting the stability of the instrument.

Why the other options are incorrect:

B. Kuder-Richardson (KR-20) coefficient

The Kuder-Richardson (KR-20) coefficient is a measure of the internal consistency reliability of dichotomous items (i.e., items with two possible responses such as true/false or yes/no). While this is a form of reliability testing, it is not specifically used to measure the stability of an instrument over time.

D. Cronbach's alpha

Cronbach's alpha is also a measure of internal consistency, but it assesses how well items on a test measure the same underlying concept. Like the KR-20, it is used to evaluate reliability in terms of consistency, not stability over time.

Summary:

Tests that estimate the stability of an instrument include test-retest reliability (A) and parallel reliability (C). The KR-20 coefficient (B) and Cronbach's alpha (D) assess internal consistency, not stability.

Correct answer:

B. Manipulation of the independent variable

C. An experimental study

Explanation of the correct answers:

B. Manipulation of the independent variable

The administration of an intervention to one group of subjects and not another is an example of manipulating the independent variable. In experimental research, the independent variable is the factor that the researcher manipulates to observe its effect on the dependent variable. The intervention represents this manipulation.

C. An experimental study

This type of intervention setup is characteristic of an experimental study. Experimental research involves the manipulation of an independent variable to examine its effect on the dependent variable, often with random assignment to different groups (e.g., treatment group vs. control group).

Why the other options are incorrect:

A. Homogeneity of subjects

Homogeneity of subjects refers to the degree to which subjects are similar in terms of characteristics (e.g., age, gender, health status). While homogeneity is important in controlling extraneous variables, the action of administering an intervention to one group and not another doesn't directly relate to homogeneity, which is about subject characteristics.

D. The introduction of bias

The administration of an intervention to one group and not another does not necessarily introduce bias. However, if the assignment of subjects to groups is not random or if there are systematic differences between groups that affect outcomes, bias can be introduced. The action itself is not automatically biased, but bias could arise depending on the study design and how groups are formed.

Summary:

The administration of an intervention to one group of subjects and not another is a hallmark of manipulation of the independent variable and is characteristic of an experimental study. This is a key feature in experimental research designs.

Correct answer: A. Right to fair treatment and protection

Explanation of the correct answer:

A. Right to fair treatment and protection

The 1994 Ivory Coast, Africa research study violated the right to fair treatment and protection because the research conducted involved unethical practices. In this case, it was reported that researchers tested a new treatment for HIV on pregnant women without proper consent and without considering the potential risks and the vulnerable status of the participants. The ethical principle of fair treatment and protection demands that all participants in research be treated with fairness and that their rights are respected, particularly in terms of ensuring their safety and well-being. The violation in this study included not protecting the participants from harm and not ensuring they were treated fairly.

Why the other options are incorrect:

B. Right to institutional approval of program before implementation

While institutional approval is an important ethical consideration in research, particularly regarding the review of protocols to ensure ethical standards, the specific violation in the Ivory Coast study was more about the lack of fair treatment and protection of participants, not about the absence of institutional approval. The ethical breach was more concerned with the treatment of individuals during the study, not the approval process.

C. Right to freedom from coercion or constraint

This principle is concerned with ensuring that participants are not coerced or forced into participation. While the Ivory Coast study likely involved some elements of coercion, the primary violation was more about the lack of fair treatment and protection, such as failing to ensure that participants were properly informed or safeguarded. Coercion is part of this violation, but it wasn't the central ethical issue.

D. Right to be informed about the purpose of the research

While informed consent and understanding the purpose of research are critical, the core issue in the Ivory Coast study involved the overall lack of protection for participants, which included improper consent procedures and exposing them to risk without adequate safeguards. The issue went beyond just informing the participants and extended to their treatment and protection throughout the study.

Summary:

The 1994 Ivory Coast study violated the right to fair treatment and protection, as participants were exposed to potential harm, lacked proper informed consent, and were not protected in line with ethical research standards. This highlights the importance of safeguarding participants' well-being and ensuring that they are treated fairly in all research studies.