In criminal justice experiments, what serves as a guard against the effects of the experiments themselves as well as events that may occur outside the laboratory during the course of experiments?
a. variable groups
b. control groups
c. administrative groups
d. posttest groups
Question 2
When neither the subjects nor the researcher can identify which group is the control group and which is the experimental group, the design is said to be:
a. cross-sectional
b. double-blind
c. a blind experiment
d. of no value
Controlled Experiments Manipulate a Variable
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