Find the honestly significant mean difference (HSD). What does this number mean in plain English?
A social psychologist would like to examine the relationship between personal appearance and authority. A special questionnaire is prepared which requires very careful attention to instructions in order to fill it in correctly. Three random samples of college students are obtained. For the first group, the psychologist dresses very casually (blue jeans and T-shirt) when the questionnaire is administered. For the second sample, the psychologist wears a suit, and for the third sample, the psychologist wears a very “scientific” laboratory coat. The psychologist records the number of errors made by each individual while completing the questionnaire. These data are as follows:
Blue Jeans Suit Lab Coat
4 2 1
5 4 2
4 1 1
7 3 2
4 2 2
Ans: 1.77, using an alpha level of .05; this means for a difference between two means to be statistically significant, that difference must be 5.13 or greater.
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Fill in the blank(s) with the appropriate word(s).
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