   Chapter 11.3, Problem 2LCA Essentials of Statistics for the B...

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

Solutions

Chapter
Section Essentials of Statistics for the B...

8th Edition
Frederick J Gravetter + 1 other
ISBN: 9781133956570
Textbook Problem

Compute the effect size using both Cohen’s d and r2 acupuncture study previous question.

To determine

To find: Cohen’s d and r2

Explanation

Given info:

A sample of 4 individuals is selected from a population. The sample mean and sum of squared difference (SS) is found to be 4.5 and 27 respectively. Value of s equals 3 and df=3. Two-tailed hypothesis test using α=0.05 is performed and value of t-statistics was 3.

Calculations:

Formula for Cohen’s d is:

Cohens d=Mμs2

Substitute 4.5 for M, 0 for μ and 9 for s2 in the above formula

Cohens d=4.509=4

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