When You Have an Effect Size of 1

Multiple Choice

When you have an effect size of 1.2 from an analysis using one group pretest and posttest, it means:

A) That the posttest scores are slightly more than two standard deviations better than the pretest scores.
B) That the posttest scores are slightly more than a standard deviation better than the pretest scores.
C) That the posttest scores are the same as the pretest scores.
D) That the posttest scores are slightly less than the pretest scores.