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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. compute r 2 and the estimated Cohen's d to measure the sue of the treatment effect. b. Assuming that the sample standard deviation is s = 20, compute r 2 and the r 2 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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Essentials of Statistics for the B...

8th Edition
Frederick J Gravetter + 1 other
Publisher: Cengage Learning
ISBN: 9781133956570
BuyFind

Essentials of Statistics for the B...

8th Edition
Frederick J Gravetter + 1 other
Publisher: Cengage Learning
ISBN: 9781133956570

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. compute r2 and the estimated Cohen's d to measure the sue of the treatment effect.

b. Assuming that the sample standard deviation is s = 20, compute r2 and the r2 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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