A group of 4^th grade students who were taught methods to increase their classroom participation are compared to a group of students who did not receive the classroom participation training on an academic achievement test. The mean of the students in the high classroom participation group on the academic achievement test is M_Treatment = 120 and the low classroom participation students group mean was M _Control = 105 and their pooled standard deviation is SD = 22. Compute the effect size of the difference between the two means using Cohen's d statistic as illustrated in Chapter 3. What is the correct effect size?

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