A researcher used a pretest-posttest, control group quasi-experimental design.The experimental group had a mean achievement test score of 40 on the pretest and 70 on the posttest.The control group had a mean achievement score of 50 on the pretest and 60 on the posttest.What statistical technique should the researcher use to analyze these data?
A) t-test
B) ANOVA (analysis of variance)
C) ANCOVA (analysis of covariance)
D) chi-square

Question

Quizplus · Accepted Answer

ANCOVA (analysis of covariance) should be used because it can control for the pretest scores, which were different between the experimental and control groups. This will allow for a more accurate comparison of the posttest scores between the groups. A t-test or ANOVA would not control for pretest scores, and a chi-square would not be relevant for this type of data.

A Researcher Used a Pretest-Posttest, Control Group Quasi-Experimental Design