A researcher selects a sample from a population with = 30 and uses the sample to

Question

A researcher selects a sample from a population with = 30 and uses the sample to evaluate the effect of a treatment. After treatment, the sample has a mean of M = 32 and a variance of s^2 = 6. If Cohen's d is used to measure the size of the treatment effect, which of the following would have no effect on the value of Cohen's d? a. Increase the number of individuals in the sample b Increase the sample mean C. Increase the ample variance d. All of the other options will influence the value of Cohen's d.

Explanation / Answer

Q.11 Cohen's d = Mean difference/ Standard Deviation(standard error of sample mean)

a. sample size n will not effect the cohen's d so it is a correct option.

b. Increase the sample mean will effect the cohen's d so wrong option.

c. Increase the sample variance will increase the denominator part so it will affect the cohen's d

.so option a is correct.

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