DrDavis Is Planning a Study on the Effect of Rewards

Multiple Choice

Dr.Davis is planning a study on the effect of rewards on the academic achievement of young children.For his study,Dr.Davis decides to use white,male children from an upper-class neighborhood.Having taken an introductory psychology course,you can see that Dr.Davis is going to have some problems because he won't necessarily be able to apply his results to girls or to students of other demographics.This particular problem substantially weakens the ___________ of Dr.Davis's study.

A) external validity
B) control validity
C) internal validity
D) survey validity