A recent report indicates that physically attractive people are also perceived as being more intelligent (Eagly, Ashmore, Makhijani, & Longo, 1991). As a demonstration of this phenomenon, a researcher obtains a set of 10 photographs, five showing men who were judged to be attractive and five showing men who were judged as unattractive. The photographs are shown to a sample of n = 25 college students, and the students are asked to rate the intelligence of the person in each photo on a scale from 1 to 10. For each student, the researcher determines the average rating for the five attractive photos and the average for the five unattractive photos, and then computes the difference between the two scores.
For the entire sample, the average difference was MD = 2.7 (attractive photos rated higher) with s = 2.00. 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.
t-critical =
t =
The results indicate:
Rejection of the null hypothesis; there is a significant difference in perceived intelligence for the two sets of photos
Failure to reject the null hypothesis; there is no significant difference in perceived intelligence for the two sets of photos
Rejection of the null hypothesis; there is no significant difference in perceived intelligence for the two sets of photos
Failure to reject the null hypothesis; there is a significant difference in perceived intelligence for the two sets of photos