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A random sample of n = 16 scores is obtained from a population with a mean of μ = 45 . After a treatment is administered to the individuals in the sample, the sample mean is found to be M = 49.2 . a. Assuming that the sample standard deviation is s = 8 , computer r 2 and the estimated Cohen’s d to measure the size of the treatment effect. b. Assuming that the sample standard deviation is s = 20 . computer r 2 and the estimated Cohen’s d to measure the size of the treatment effect. c. Comparing your answers from parts a and b , how does the variability of the scores in the sample influence the measures of effect size?

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Statistics for The Behavioral Scie...

10th Edition
Frederick J Gravetter + 1 other
Publisher: Cengage Learning
ISBN: 9781305504912
BuyFind

Statistics for The Behavioral Scie...

10th Edition
Frederick J Gravetter + 1 other
Publisher: Cengage Learning
ISBN: 9781305504912

Solutions

Chapter
Section
Chapter 9, Problem 18P
Textbook Problem

A random sample of n = 16 scores is obtained from a population with a mean of μ = 45 . After a treatment is administered to the individuals in the sample, the sample mean is found to be M = 49.2 .

a. Assuming that the sample standard deviation is s = 8 , computer r 2 and the estimated Cohen’s d to measure the size of the treatment effect.

b. Assuming that the sample standard deviation is s = 20 . computer r 2 and the estimated Cohen’s d to measure the size of the treatment effect.

c. Comparing your answers from parts a and b, how does the variability of the scores in the sample influence the measures of effect size?

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