The nurse is conducting a research study on the effects of back massage on older adults. Baseline pulse and blood pressure measurements are obtained for each subject. One-half of the subjects receive a back massage, and the other half does not. Three sets of blood pressure and pulse measurements are taken on all subjects following the back massage received by one-half of the subjects. Ten minutes are spent with each subject while taking these measurements.
What is the independent variable?
Older adults.
Back massage.
Blood pressure and pulse measurements.
Time spent with each client.
The Correct Answer is B
Choice B rationale:
Back massage. Rationale: In an experimental design, the independent variable is the one that is manipulated or changed to observe its effect on the dependent variable. In this study, one group of subjects receives a back massage, while the other group does not. Therefore, the independent variable is the administration of a back massage.
Choice A rationale:
Older adults. Rationale: Older adults are the population being studied, but they are not the variable being manipulated in the experiment. They are a part of the study's population.
Choice C rationale:
Blood pressure and pulse measurements. Rationale: Blood pressure and pulse measurements are the dependent variables in this study. They are being measured to assess the effect of the independent variable (back massage) on these physiological parameters.
Choice D rationale:
Time spent with each client. Rationale: The time spent with each client is not the variable being manipulated in the experiment. It may be a controlled variable or a factor that is observed but not manipulated.
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Related Questions
Correct Answer is A
Explanation
Choice A rationale:
A meta-analysis that concluded that bone density improved among individuals who took Vitamin D. Rationale: A meta-analysis provides the highest level of evidence among the options listed. It synthesizes data from multiple studies, often randomized controlled trials (RCTs), to draw conclusions about the effectiveness of an intervention. In this case, the meta-analysis concluded that bone density improved among individuals who took Vitamin D, suggesting strong evidence to support its use.
Choice B rationale:
A cross-sectional study that found a strong relationship between Vitamin D intake and bone density. Rationale: Cross-sectional studies can identify associations between variables but cannot establish causality. While this study found a strong relationship, it does not provide as strong evidence as a meta-analysis of RCTs.
Choice C rationale:
A cohort study that concluded low levels of Vitamin D were linked to decreased bone mineral density. Rationale: Cohort studies can provide valuable evidence, but they may have limitations, such as confounding variables. While this study suggested a link, it may not be as robust as a meta-analysis of RCTs.
Choice D rationale:
A time series design study that reported that those who took Vitamin D had improved bone density. Rationale: Time series designs can be useful for assessing changes over time, but they may have limitations in terms of establishing causality. Additionally, the strength of evidence from a single time series study may not be as high as that from a meta-analysis of multiple RCTs.
Correct Answer is B
Explanation
Choice B rationale:
Apply for institutional review board (IRB) approval for a study involving human subjects is the most important step before conducting the experimental study. IRB approval is crucial to ensure that the research is conducted ethically, with proper consideration for participant safety and rights. It also assesses the study's design, methods, and consent process to protect participants.
Choice A rationale:
Determining what instruments are available to measure the independent variable is essential but typically follows the IRB approval process. It is part of the research planning and implementation stages.
Choice C rationale:
Obtaining release forms from parents allowing their children to participate in the study is important but is a step that follows IRB approval. Informed consent processes are typically reviewed by the IRB.
Choice D rationale:
Reviewing the literature to determine if other research projects have addressed this issue is valuable but is part of the research planning and background information gathering stage. While it is important, obtaining IRB approval takes precedence as it ensures the ethical conduct of the study.
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