Dr.Feldman was interested in the effect of Valium on motor performance.He injected 30 rats in the experimental group with a small amount of Valium and 30 rats in the control group with saline solution.Following injection, he measured the rate of bar pressing by both groups of rats.On average, rats in the control group had 800 presses per hour and rats in the experimental group had 715 presses per hour.The same testing box was used for both groups of rats, but different student assistants tested the control and experimental groups.In this example, having two different student assistants test the two groups is a(n) _____ variable.
A) confounding
B) ordinal
C) independent
D) dependent

Question

Quizplus · Accepted Answer

The use of different student assistants to test the control and experimental groups is a confounding variable because it introduces an extraneous factor that could potentially affect the results and make it difficult to determine if any differences in bar pressing rates between the groups were due to the Valium injection or the different student assistants.

DrFeldman Was Interested in the Effect of Valium on Motor