An experiment in which extraneous variables are controlled is said to be
A) internally reliable
B) internally valid
C) externally valid
D) externally reliable

Question

Quizplus · Accepted Answer

Controlling extraneous variables means eliminating other possible explanations for the results obtained, which helps to increase the internal validity of the experiment. Internal validity refers to the extent to which an experiment measures what it was intended to measure, while external validity refers to the extent to which the results can be generalized to other settings or populations. Therefore, the best choice is B.

An Experiment in Which Extraneous Variables Are Controlled Is Said