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Erica is running a study to investigate the effect of exercise on insomnia symptoms. She recruits participants who report having experienced insomnia at least once a week and assigns them to either exercise for 30 minutes every day or to read a book for 30 minutes every day.
-How many level/s of the experimental variable is/are there in her study?
A) 30
B) 1
C) 2
D) 60

Question

Quizplus · Accepted Answer

In Erica's study, the experimental variable is the activity that the participants are assigned to do every day, which is either to exercise or to read a book. There are two distinct levels of this experimental variable: 1) exercising for 30 minutes, and 2) reading for 30 minutes. Therefore, the correct answer is 2 levels of the experimental variable.

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