A nurse is reviewing a research article that compared Hemoglobin A1c (HbA1C) findings of randomly selected 20 to 30-year-old clients with diabetes who participated in a specified 3- month strenuous exercise program with 20 to 30-year-old clients who did not participate in the exercise program. Which research design describes this study?
Correlational.
Exploratory.
Experimental.
Developmental.
The Correct Answer is C
A. Correlational studies examine the relationship between variables but do not involve manipulation of variables, which is a key characteristic of experimental studies.
B. Exploratory studies aim to explore a new area or phenomenon, often using qualitative methods or preliminary investigations, which may not involve comparing groups with different interventions.
C. Experimental studies involve the manipulation of an independent variable (in this case, participation in the exercise program) to observe its effects on a dependent variable (HbA1C findings). This design allows for causal inferences about the relationship between the intervention and outcome.
D. Developmental studies focus on changes over time or across different life stages, which may involve longitudinal or cross-sectional designs but do not necessarily involve experimental manipulation of variables.
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Related Questions
Correct Answer is A
Explanation
A. A significance level of p<.001 indicates a very high level of statistical significance, and a sample size of 73 subjects provides a relatively large sample for the study. This combination of a highly significant p-value and a substantial sample size lends strong support to the findings reported in the research proposal.
B. A p-value of .301 is not statistically significant at the conventional level of .05, indicating weak evidence to support the findings. Additionally, a sample size of 24 subjects is relatively small, which may limit the generalizability of the results.
C. A significance level of p<.031 is statistically significant but not as strong as a p-value of <.001. However, the sample size of 54 subjects is moderate, providing some support for the findings reported.
D. A significance level of p < .01 is statistically significant, but the sample size of 15 subjects is relatively small, which may limit the reliability and generalizability of the findings.
Correct Answer is D
Explanation
A. Longitudinal studies involve observing the same subjects over an extended period to assess changes over time. The study described involves comparing two groups (control and experimental) at one point in time, rather than observing changes in the same subjects over time.
B. Quasi-experimental studies resemble experimental designs but lack random assignment to groups or lack control over certain variables. The study described involves random assignment to groups (control and experimental), making it an experimental design rather than quasi-experimental.
C. Descriptive studies involve observing and describing phenomena without manipulating variables or testing hypotheses. The study described involves manipulation of the independent variable (instruction type) and comparison of outcomes, making it experimental rather than descriptive.
D. Experimental studies involve manipulating an independent variable to observe its effect on a dependent variable while controlling for other variables. The study described involves randomly assigning subjects to control and experimental groups, manipulating the type of instruction, and comparing knowledge levels before and after the intervention, indicating an experimental design.
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