A researcher wants to know whether wearing sunglasses improves driving performance.In a counterbalanced repeated measures design,presence or absence of sunglasses would be varied by
A) randomly assigning half the drivers to a sunglasses condition and half to a no-sunglasses condition.
B) having all drivers first drive without sunglasses and then with sunglasses.
C) having half the drivers first drive without sunglasses and then with sunglasses and having the other half first drive with sunglasses and then without sunglasses.
D) having all drivers first drive with sunglasses and then without sunglasses.

Question

Quizplus · Accepted Answer

A counterbalanced repeated measures design requires the manipulation of the independent variable (presence or absence of sunglasses) to be counterbalanced, meaning that all participants experience both conditions in a different order. Option A and D are incorrect because they do not counterbalance the order of the conditions. Option B requires all participants to first experience the no-sunglasses condition, eliminating the possibility of counterbalancing. Therefore, option C is the best choice as it counterbalances the order of the conditions by dividing participants into two groups and alternating the order of the conditions they experience.

A Researcher Wants to Know Whether Wearing Sunglasses Improves Driving