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| Teaching Since: | May 2017 |
| Last Sign in: | 408 Weeks Ago, 3 Days Ago |
| Questions Answered: | 66690 |
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MCS,PHD
Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
Professor
Phoniex University
Oct-2001 - Nov-2016
A survey researcher compares four religious groups on their attitude toward education. The survey is sent out to 1200 subjects, of which 823 eventually responded. Ten items, Likert scaled from 1 to 5, are used to assess attitude. A higher positive score indicates a more positive attitude. There are only 800 usable responses. The Protestants are split into two groups for analysis purposes. The group sizes, along with the means and standard deviations, are given below:
Â

An analysis of variance on these four groups yields F = 311.66/55.58 = 5.61, which is significant at the .001 level.
(a) Estimate power at the .05 level for the above example.
(b) Calculate the effect size, and discuss the practical significance issue.
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