Gerontologists interested in the effects of age on reaction time have two groups
ID: 3070060 • Letter: G
Question
Gerontologists interested in the effects of age on reaction time have two groups of participants 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 participants is between the age of 25 and 45, whereas the other group of participants is between the age of 55 and 75. 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 a participant variable?
Explanation / Answer
(a) Independent Variable: age
(b) Dependent Variable: Reaction Time
(c)
(i) Control Group: Group of participants between the age of 25 and 45
(ii) Experimental Group: Group of participants between the age of 55 and 75
(d)
The Independent Variable, age, is Manipulated Variable, because the age is changed on purpose. It is not a Participant Vatriable, because it is not an extraneous variable affecting the dependent variable.
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