HESI Nursing Research Exam

Correct answer: B. Instrumentation

Explanation of the correct answer:

B. Instrumentation

Instrumentation is a threat to internal validity that occurs when there are changes in the measurement tools or instruments used during the study, which can lead to inconsistencies in how data is collected or measured. In this scenario, if the researcher is using six people to collect data, there is a possibility that the tools or methods used by each data collector might differ, leading to variation in the data. This inconsistency could introduce bias or affect the reliability and validity of the study's findings, thereby threatening internal validity.

Why the other options are incorrect:

A. History

History refers to events that occur outside of the study but affect the participants over time. In this case, the threat is related to data collection, not external events, so history is not the issue here.

C. Maturation

Maturation refers to changes in participants over time due to aging or other natural development processes. Since this study focuses on the data collectors, rather than the participants themselves, maturation is not a primary concern.

D. Selection effects

Selection effects occur when there is a bias in how participants are chosen or assigned to different groups. While selection bias could be a concern for the study's participants, this question is specifically about the data collectors, so selection effects are not the primary issue.

Summary:

Instrumentation is a potential threat to internal validity in this case because differences in how the data collectors use tools or instruments could lead to inconsistencies or errors in data collection.

Correct answer: A. Qualitative

Explanation of the correct answer:

A. Qualitative

Qualitative research is the type of research that can be most affected by the values of the researcher. This is because qualitative research often involves the researcher’s direct interaction with the participants and is typically focused on understanding human experiences, behaviors, and perspectives in a deep, contextualized way. The researcher’s personal beliefs, experiences, and biases can influence how they interpret the data, interact with participants, and draw conclusions. Therefore, qualitative research requires careful attention to reflexivity, where researchers acknowledge and reflect on how their values may influence the study.

Why the other options are incorrect:

B. Naturalistic

Naturalistic research is a type of qualitative research that focuses on observing and interpreting behaviors in their natural settings. While the researcher aims to minimize influence, naturalistic research still involves human interaction, and the researcher’s values could still shape their interpretations. However, the term "naturalistic" refers more to the setting and approach, not specifically the impact of researcher values.

C. Ethnographic

Ethnographic research is a type of qualitative research that involves studying cultures or social groups through immersive observation. While ethnographic research also requires the researcher to be aware of their influence on the study, it is still a qualitative approach. However, because ethnographic research is highly immersive and involves direct engagement with the group being studied, the researcher’s values may indeed affect the findings. This is similar to other qualitative research but is not the primary focus of ethnography.

D. Quantitative

Quantitative research is designed to minimize subjectivity and bias through objective measurement, statistical analysis, and controlled experimental conditions. While researcher biases can still affect aspects of quantitative research (e.g., in the design or interpretation of results), it is less likely to be directly influenced by the researcher’s values compared to qualitative research, which is more subjective and interpretive in nature.

Summary:

Qualitative research is the type of research most affected by the researcher’s values because it involves subjective interpretation of data and deep engagement with participants. The researcher’s values and perspectives can influence data collection, analysis, and interpretation. Therefore, A is the correct answer.

Correct answer: A. Sample selection is carried out inconsistently.

Explanation of the correct answer: A. Sample selection is carried out inconsistently. Bias is introduced into a study when the process of selecting participants is inconsistent or non-random, which can result in a sample that is not representative of the larger population. Inconsistent selection can lead to overrepresentation or underrepresentation of certain groups, which can skew the study results and affect the validity of the conclusions.

Why the other options are incorrect:

B. Subjects do not volunteer to participate. While the lack of volunteer participation can affect the generalizability of a study's findings, it does not directly introduce bias in the selection process. Bias is more likely to occur if the selection method itself is flawed, regardless of whether subjects volunteer or not.

C. Probability sampling techniques are used. Probability sampling techniques are designed to reduce bias by giving each member of the population an equal chance of being selected. This helps ensure that the sample is representative of the population, reducing the risk of bias.

D. The population is homogeneous. A homogeneous population means that the members of the population are similar in some way, such as having the same characteristics or behaviors. While this might limit the generalizability of the findings, it does not necessarily introduce bias into the study itself. Bias typically arises from how the sample is selected or how data is collected.

Summary: Bias is introduced into a study when sample selection is carried out inconsistently, leading to a sample that may not accurately represent the population of interest. This can distort the results and reduce the validity of the study.

Correct answer: D. Extraneous variables

Explanation of the correct answer:

D. Extraneous variables

To avoid threats to validity, a researcher must identify, plan for, and control extraneous variables. These are variables that are not the focus of the study but could influence the dependent variable and confound the results if not properly controlled. Managing extraneous variables helps ensure that the findings are due to the independent variable rather than other unaccounted factors.

Why the other options are incorrect:

A. Independent variables

While the independent variables are crucial to the study, they are not considered a threat to validity. The goal is to manipulate and measure independent variables, not to control them in the same way as extraneous variables.

B. Unexpected findings

Unexpected findings are results that emerge during a study. While these findings may prompt further exploration, they do not directly threaten validity. Validity threats are more related to uncontrolled variables that can distort the relationship between the independent and dependent variables.

C. The control group

The control group is used to compare with the experimental group, but its purpose is not to avoid threats to validity. It helps to establish a baseline to see the effect of the independent variable, not to control for extraneous variables.

Summary:

To ensure the validity of the research findings, it is essential to identify, plan for, and control extraneous variables that could influence the results and introduce bias or confounding factors.

Correct answer: D. The Experience of Mother-Child Bonding in Inner-City Populations

Explanation of the correct answer:

D. "The Experience of Mother-Child Bonding in Inner-City Populations"

This study title clearly indicates qualitative methodology because it focuses on exploring the "experience" of a specific group of people—in this case, mother-child bonding in inner-city populations. Qualitative research is often used to explore and understand human experiences, perceptions, and social phenomena in-depth. This title suggests the researchers will likely collect narrative data through interviews, observations, or other means to understand how these experiences are lived and perceived by the participants.

Why the other options are incorrect:

A. "Comparison of Nursing Assessment Techniques in Hospitals and Home Care Settings"

This title suggests a comparative study, which is typically quantitative in nature. The term "comparison" implies measuring and comparing specific variables (nursing assessment techniques) across two different settings (hospitals and home care). Quantitative methods would be used to assess and compare measurable differences in these techniques.

B. "The Relationship between Numbers of Errors Made and Educational Preparation"

This title implies a quantitative study because it focuses on the relationship between two variables: the number of errors made and educational preparation. Quantitative studies typically measure variables numerically and analyze relationships between them using statistical methods.

C. "The Effectiveness of Patient Teaching Pre- and Postoperatively"

This study title suggests a focus on evaluating an intervention (patient teaching) and measuring its effectiveness before and after a procedure. The use of the term "effectiveness" implies the study is likely quantitative, as it seeks to measure outcomes and compare results before and after the intervention, typically using numerical data and statistical analysis.

Summary:

The title "The Experience of Mother-Child Bonding in Inner-City Populations" indicates a qualitative methodology because it focuses on exploring personal, subjective experiences, which is the hallmark of qualitative research. The other titles suggest studies that involve measurable variables or comparisons, which are characteristic of quantitative research.

Correct answer: A. Restricted by a priori frameworks

Explanation of the correct answer:

A. Restricted by a priori frameworks

This category applies when the researcher finds that the existing theories or frameworks (a priori frameworks) are overly influential or limiting, thereby hindering the exploration of new data or findings. In such a situation, the study may have to be aborted or adjusted because the theoretical framework has distorted or obscured the raw data, preventing the emergence of new insights. The existing theory interferes with the researcher’s ability to explore the phenomena in its natural state, leading to restricted findings.

Why the other options are incorrect:

B. Descriptive categories

Descriptive categories involve organizing data into meaningful categories that reflect the observed patterns and experiences in the study. This category focuses on the clarity of the data and its description rather than on how existing frameworks may obstruct the findings. It doesn't directly address issues of theory obstructing the study.

C. Shared pathway or meaning

This category focuses on the identification of common themes or pathways among participants. It is about understanding the shared experiences or meanings among individuals. While important in qualitative research, it does not specifically relate to the problem of being hindered by pre-existing theories or frameworks, as described in the scenario.

D. Depiction of experiential variation

This category refers to representing the diverse and varied experiences of individuals within the study. It is concerned with the differences in participants' experiences, rather than with the impact of a pre-existing theory obstructing the findings. It does not align with the issue of being restricted by theoretical frameworks.

Summary:

A. Restricted by a priori frameworks is the most appropriate category when a study is obstructed by an existing theory or framework, as it limits the ability of the researcher to explore and discover new findings naturally emerging from the data. In such cases, the theory may overpower the data, leading to a need to abort or modify the study.

Correct answer: A. Maturation, C. Testing

Explanation of the correct answers:

A. Maturation

Maturation is a threat to internal validity because participants naturally change over time. In this study, the children are tested at two different points (third and sixth grade), and over these three years, they may experience cognitive, emotional, or physical changes that could affect their IQ scores. These changes are independent of any variables the researcher may be controlling for, so maturation could explain the differences in IQ scores between the groups.

C. Testing

Testing is a threat to internal validity because repeated testing can affect the results. If the children are tested at both the third and sixth grade levels, their performance on the second test might be influenced by their experience with the first one. For example, they could perform better because they are more familiar with the testing process or have become accustomed to the types of questions asked.

Why the other option is incorrect:

B. History

History refers to events that occur outside of the study that might impact the participants. In this scenario, there is no indication that external events occurred that would directly influence the participants' IQ scores between the third and sixth grade, so history is not considered a significant threat in this case.

Summary:

Maturation and testing effects are the primary threats to internal validity in this study, as the children may undergo natural changes over time and their prior testing experiences could influence their results.

Correct answer: B. Correlational

Explanation of the correct answer:

B. Correlational

An ex post facto study is classified as a correlational study because it examines the relationship between variables after the events have already occurred, without any manipulation by the researcher. The term ex post facto means "after the fact," and this type of study investigates causes or relationships retrospectively. Researchers observe existing conditions or outcomes and try to determine if there are any associations with past variables. Since there is no manipulation of the independent variable and no random assignment, ex post facto studies cannot establish causation—only correlation. This makes them a subtype of nonexperimental, correlational research.

Why the other options are incorrect:

A. Survey

While surveys are used to collect data about people's opinions, behaviors, or characteristics, they are not inherently designed to explore relationships between past events and current outcomes. A survey could be part of an ex post facto study, but the survey itself does not define the study type. Survey research is primarily descriptive, not relational or explanatory in nature.

C. Developmental

Developmental studies examine changes over time in individuals or groups, often using longitudinal designs. These studies focus on growth, aging, or development stages rather than exploring the relationships between past events and present outcomes. Therefore, they do not align with the retrospective nature of ex post facto research.

D. Experimental

Experimental studies involve the deliberate manipulation of variables and the use of control groups and randomization to determine cause-and-effect relationships. In contrast, ex post facto studies do not involve any manipulation; they study variables as they naturally exist after the fact. Because of this, ex post facto studies cannot be classified as experimental.

Summary:

Ex post facto studies investigate relationships between variables retrospectively and without manipulation, making B. Correlational the correct classification. Survey, developmental, and experimental studies differ significantly in design and purpose and do not align with the characteristics of ex post facto research.

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.