An Experiment Was Designed to Test the Effects of Rehearsal

Multiple Choice

An experiment was designed to test the effects of rehearsal on memory. In order to hold the extraneous variable "time of day" constant, the experimenter decides to run two groups simultaneously. The rehearsal group is given the instructions live and the other non-rehearsal group sees the same instructions in the next room via closed-circuit television. Live-versus- television is

A) an extraneous variable, but not a confounding variable.
B) a confounding variable, but not an extraneous variable.
C) neither an extraneous nor a confounding variable.
D) both an extraneous and a confounding variable.