The addition of a control group
a. permits a basis for comparison when the independent variable is manipulated.
b. increases the validity of the operational definition.
c. works best with human participants.
d. assures a random sample of subjects.
e. is only necessary in correlational studies.
a. permits a basis for comparison when the independent variable is manipulated.
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In deafness, conduction deafness is to as nerve deafness is to
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