A design in which a series of measures are taken on two or more groups both before and after treatment is a(n)_____ design.
A)experimental
B)multiple-group time-series
C)nonequivalent control group posttest only
D)nonequivalent control group pretest/posttest

Question

Quizplus · Accepted Answer

A multiple-group time-series design involves taking measures on two or more groups before and after treatment. This design is different from the other options listed, which involve a control group for comparison purposes. In an experimental design, there is a control group that does not receive treatment, and in a nonequivalent control group pretest/posttest design, there is a control group that is not randomly assigned, which makes it difficult to draw conclusions about the effectiveness of the treatment. The nonequivalent control group posttest only design also lacks a pretest measure for comparison, which makes it difficult to determine if any changes observed are a result of the treatment or other factors.

A Design in Which a Series of Measures Are Taken