Chapter 13, Problem 13P

In Problem 6 at the end of Chapter 11 (page 325), we presented a study showing that a visible tattoo can significantly lower the attractiveness rating of a woman shown in a photograph (Resenhoeft, Villa, & Wiseman, 2008). In a similar study, a sample of n = 9 males looks at a set of 30 photographs of women and rates the attractiveness of each woman using a 10-point scale (10 - most positive). One photograph appears twice in the set. Once, with a tattoo and once with the tattoo removed. For each participant, the researcher records the ratings for the two photographs. The results are shown in the following table.

1. a. Use a repeated-measures ANOVA with α = .05 to determine whether the mean different between treatments is significant.
2. b. Now use a repeated-measures r test with α = .05 to evaluate the mean different between treatments, Comparing your answers from a and b, you should find that F = t^2.

Participant	No Tattoo	With Tattoo
A	7	5
B	9	3
C	7	5
D	8	3
E	9	8
F	6	3
G	6	6
H	8	3
I	6	3