Two tailed test at the .05 level
of significance.
12. A recent report indicates that
physically attractive people are also perceived as being more intelligent. As a
demonstration of this phenomenon, a researcher obtained a set of 10 photos, 5
showing men who were judged to be attractive and 5 showing men who were judged
to be unattractive. The photos were shown to a sample of n=25 college students
and the students were asked to rate the intelligence of the person in the photo
on a scale from 1 to 10. For each student, the researcher determined the
average rating for the 5 attractive photos, and the average for the 5
unattractive photos, and then computed the difference between the two scores.
For the entire sample, the average difference was Md=2.7 (attractive photo
rated higher) with s =2.0. are the data sufficient to conclude that there was a
significant difference in perceived intelligence for the two sets of photos?
Use a two tailed test at the .05 level of significance.
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