When we switch replications in a non-equivalent comparison group design, we:
A) administer the treatment to the control group before posttesting.
B) can determine whether the difference between the groups at the first posttest may be attributed to the lack of comparability between the two groups.
C) decrease the chances of determining whether the difference between the groups at the first posttest may be attributed to a selection bias.
D) decrease the internal validity of the design.

Question

When we switch replications in a non-equivalent comparison group design, we:​
A) ​administer the treatment to the control group before posttesting.
B) can determine whether the difference between the groups at the first posttest may be attributed to the lack of comparability between the two groups.​
C) decrease the chances of determining whether the difference between the groups at the first posttest may be attributed to a selection bias.​
D) decrease the internal validity of the design.​

Quizplus · Accepted Answer

When we switch replications in a non-equivalent comparison group design, we can determine whether the difference between the groups at the first posttest may be attributed to the lack of comparability between the two groups. This is because switching replications allows us to compare the treatment group's performance to a new (and hopefully more comparable) control group. However, it does not necessarily decrease the chances of determining whether the difference between the groups at the first posttest may be attributed to a selection bias, and it does not necessarily decrease the internal validity of the design. Administering the treatment to the control group before posttesting would not be a valid option in this scenario.

When We Switch Replications in a Non-Equivalent Comparison Group Design