The Double-Blind Procedure Strengthens the Internal Validity of a Study

Multiple Choice

The double-blind procedure strengthens the internal validity of a study because

A) it minimizes the effect of experimenter or participant expectations on the outcome of an experiment
B) it creates more confounding variables in the experiment so the experimenter can be assured of validity
C) it eliminates the problem of the participants' social desirability bias
D) it insures that a given sample is representative of the population from which it is drawn