Calculate Cohen's d: Treatment Group M=10 (SD=2), Control Group M=8 (SD=2)

To calculate Cohen's d, we need the means and standard deviations of the treatment and control groups. In this case, the means are 10 and 8, and the standard deviations are 2 for both groups.

Cohen's d is calculated by taking the difference between the means of the two groups and dividing it by the pooled standard deviation. The formula is:

Cohen's d = (M1 - M2) / SDpooled

where M1 and M2 are the means of the two groups, and SDpooled is the pooled standard deviation.

In this case, the difference between the means is 10 - 8 = 2, and the pooled standard deviation is the average of the two standard deviations, which is (2 + 2) / 2 = 2.

Therefore, Cohen's d = 2 / 2 = 1.0

So, the correct answer is 1.0.