Two critical factors used to distinguish experimental designs from most nonexperimental designs are
A) randomization and equal numbers of participants.
B) elimination of all confounds and randomization.
C) control groups and randomization.
D) sophisticated data analysis and control groups.
Question 2
In an experiment, it is essential that the groups be equivalent on ________ at the start of the study.
A) the independent variable
B) the dependent measures
C) participant numbers
D) both the independent and dependent variables
Fill in the blank with the correct answer.
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