A researcher examined the effect of lighting on learning.Randomly assigned participants learned material while using a 100-watt or a 125-watt bulb.There were no differences between the two groups.The nonsignificant results may have occurred because of
A) a costly measure of learning.
B) insufficient strength of the manipulation.
C) selection differences.
D) random assignment of participants.

Question

Quizplus · Accepted Answer

The fact that there were no differences between the two groups suggests that the manipulation of using a 100-watt or a 125-watt bulb may not have been strong enough to affect learning. Therefore, insufficient strength of the manipulation may have caused the nonsignificant results.

A Researcher Examined the Effect of Lighting on Learning