4. Dependent and independent variables Aa Aa The following research studies cons

Question

4. Dependent and independent variables Aa Aa The following research studies consist of two or more groups of scores being compared. For each, decide whether the study is experimental or nonexperimental, and then identify the dependent, independent, or quasi-independent variables A researcher in a medical school would like to test the effectiveness of different insomnia treatments. She conducts a study on 120 volunteers, who are randomly assigned to five different insomnia treatment groups, one of which is a control group receiving a placebo. The number of hours slept per night is recorded for each participant over 2 weeks. This study is an example of an experimental study The number of hours slept per night over 2 weeks is theindependent treatment is thedependent ariable. ll variable. The type of insomnia Researchers at a school of public health conducted a study to test the effect of organic produce on cancer mortality. The 400 patients with prostate cancer who volunteered for the study were randomly assigned to a diet of either organic or conventional produce. The progression of their cancer was monitored, and researchers documented the length of time each patient survived This study is an example of a nonexperimental study The survival time is the independent variable. The type of diet is the l dependent variable

Explanation / Answer

It is an example of non experimental study.Because here the reeasrcher only observes the data recorded.

The number of hours slept per night over 2 weeks is the dependent variable. Because it depends on the different insomnia treatment group.The type of insomenia treatment is independent variable.

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The study is an example of non experimental study.Because the researcher monitors and documented progression and time survived.

The survival time is depended variable because it depends on type of diet.

The type of diet is independent variable.

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