Kreia is a professor at a local college. She is interested in developing a new psychometric measure of personality. To test her measure, she administers it to her class during the first week of the quarter. She administers the measure again to the same group of students three weeks later. She finds that the students’ scores differed significantly between the two time points. What type of experimental design should Kreia use?

a. within-subjects design
b. between-subjects design
c. matched-subject design
d. mixed subjects design

a. within-subjects design

Explanation:

A within subject design is an approach in which same group of subjects are used for every trial of the experiment and the each subject is exposed to every treatment and condition. Each subject is exposed to the various independent variables these variables are controlled by the experimenter. According to the given situation, the experiment is conducted on the same group of students and each received the psychometric test at different intervals of the study so the given situation is an example of within-subject design.

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