Question

If the baseline mean is 20 undesirable observed behaviors, the intervention mean is 16 undesirable observed behaviors, and the baseline standard deviation is 4, then the effect size is:

a) 0.5
b) 0.75
c) 1.0
d) 1.25

Answer 1

The effect size is 0.625, which is medium according to Cohen's standard.

Step-by-step explanation:

The effect size is 0.625, which falls between the medium (0.5) and large (0.8) effect sizes according to Cohen's standard. This means the effect size is medium.