Posted by **Laurie** on Wednesday, March 5, 2008 at 12:30am.

A random sample of n=16 scores is obtained from a population with a mean of ยต= 80 and a treatment is administered to the sample. After treatment, the sample mean is found to be M=82.

a)Assuming the sample contained n=16 individuals, measure the size of the treatment effect by computing the estimated d and r squared.

b) Assuming the sample contained n=25 individuals, measure the size of the treatment effect by computing the estimated d and rsquared.

c)comparing your answers for parts (a)and (b) , how does sample variance influence measures of effect size?

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