A researcher selects a sample from a population with m = 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 s2= 6. If cohens d is used to measure the size of the treatment effect, which of the following would NOT have effect on the cohen d value?

Increase the number of individuals in the sample

Increase the sample mean

Decrease the sample variance

All of the other options will increase the likelihood of rejecting the null hypothesis.

Question

A researcher selects a sample from a population with m = 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 s2= 6. If cohens d is used to measure the size of the treatment effect, which of the following would NOT have effect on the cohen d value? 

Increase the number of individuals in the sample

Increase the sample mean

Decrease the sample variance

All of the other options will increase the likelihood of rejecting the null hypothesis.