Author Question: It is important to assess the similarity of the experimental and control groups before any ... (Read 23 times)

ashley · **on:** Aug 4, 2018

It is important to assess the similarity of the experimental and control groups before any manipulation of the independent variable in a nonequivalent control-group design because

A) if the groups are significantly different, direction of causality cannot be determined.
B) the more similar the groups are, the greater control we have.
C) as the similarity between groups at the beginning of the study increases, the design approaches experimental designs.
D) Both B and C

Question 2

If you suspect that the groups in a nonequivalent control-group design differ on variables other than the dependent variable, you should

A) systematically identify potential confounding variables.
B) measure the variables that may be confounded.
C) carefully rule out the alternative hypotheses.
D) All of the above