A researcher wants to find out whether gross motor coordination is better in the morning or in the afternoon.To measure coordination,participants balance a book on their heads first in the morning and then in the afternoon.What is confounded with the independent variable?
A) Practice is confounded with the time of day.
B) Practice is confounded with participants.
C) The participants aren't matched.
D) There is no confound for the independent variable.

Question

Quizplus · Accepted Answer

Practice is confounded with the time of day because participants may perform better in the afternoon simply because they have had more practice balancing the book from their morning trial. This makes it difficult to determine whether any observed differences in gross motor coordination are due to time of day or practice.

A Researcher Wants to Find Out Whether Gross Motor Coordination