Gerontologistsinterestedintheeffectsofaging on reaction time have two groups of

Question

Gerontologistsinterestedintheeffectsofaging on reaction time have two groups of subjects take a test in which they must indicate as quickly as possible whether a probe word was a member of a previous set of words. One group of subjects is between the ages of 25 and 45, and the other group is between the ages of 65 and 85. The time it takes to make the response is measured. a. What is the independent variable in this study? b. What is the dependent variable in this study? c. Identify the control and experimental groups in this study. d. Is the independent variable manipulated, or is it a subject variable?

Explanation / Answer

1. The independent variable is age.

2. The dependent variable is reaction time.

3. The control group is the set of participants who are between the ages 25 to 45 and the experimental group is the set of participants who are between ages 65 and 85.

4. The independent variable is not manipulated. It is a subject variable because age cannot be manipulated.

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