A researcher obtains a mean of M 5 26 for a sample in one treatment condition and

Question:

A researcher obtains a mean of M 5 26 for a sample in one treatment condition and M 5 28 for a sample in another treatment. The pooled variance for the two samples is 16.

What value would be obtained if Cohen’s d were used to measure the effect size?

a. 2 16

b. 4 16

c. 2 4

d. There is not enough information to determine Cohen’s d

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