One way to decrease the threat of pretest-treatment interaction is
A) lengthen the time of the treatment.
B) decrease the sample size.
C) increase the significance level.
D) increase the number of conditions.

Question

Quizplus · Accepted Answer

Increasing the number of conditions allows for greater control over potential pre-existing differences between groups and enables the experimenter to better isolate the effects of the treatment. This can help decrease the threat of pretest-treatment interaction. Lengthening the time of the treatment or decreasing the sample size would not necessarily address this issue, and increasing the significance level is not recommended as it could increase the risk of Type I errors.

One Way to Decrease the Threat of Pretest-Treatment Interaction Is