suppose a reacher conducted an experiment on improving algeb

suppose a reacher conducted an experiment on improving algebra achievement, and the experimental posttest raw-score mean equaled 500 (sd=100), and the control group raw-score mean equaled 400 (sd=100). What is the value for the effect size for the experiment?

Solution

The effect size is the difference between the two means.

Therefore, the value of the effect size would be 1.00 for this experiment.

Formula:

value of the effect size=

(experimental posttest raw-score mean equaled-control group raw-score mean equaled)/standard deviation

=(500-400)/100

=1 Ans