Chapter 9, Problem 19P

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8th Edition

Frederick J Gravetter + 1 other

ISBN: 9781133956570

Textbook Problem

A random sample is obtained from a population with n mean of
*M* = 49 with a standard deviation of *s* = 12.

a. Assuming that the sample consists of *n* = *9* scores, compute *r*^{2} and the estimated Cohen's *d* to measure the size of treatment effect.

b. Assuming that the sample consists of n = 16 scores, compute *r*^{2} and the estimated Cohen's *d* to measure the size of treatment effect.

c. Comparing your answers from parts a and b_{,} how does the number of scores in the sample influence the measures of effect size?

**a.**

To determine

**To find:** The

Explanation

**Given info:**

A sample of 9 individual is selected from a population with mean 45. The sample mean, and standard deviation is 49 and 12 and the level of significance is

**Calculations:**

Formula for Cohen’s d is:

Substitute 49 for

Formula for r^{2} is:

The t-statistics is obtained by,

**b.**

To determine

**To find:** Whether or not the treatment has a significant effect for

**c.**

To determine

**To state:** The impact of sample size on the measure of effective size.

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