There is some evidence indicating that people with visible tattoos are viewed more negatively than people without visible tattoos. In a similar study, a researcher first obtained overall rating of attractiveness for a woman with no tattoos shown in a photo. On a 7-pt scale, the woman recieved an average rating of 4.9 and the distribution of the ratings was normal with a SD of .84 The researcher then modified the photo by adding a tattoo of a butterfly on the womans arm. The modified photo was then shown to a sample of n=16 students at a local community college and the students used the same 7 pt scale to rate the attractiveness. The average score for the photo with the tattoo was M= 4.2.

Do the data indicate a significant difference in rated attractiveness when the woman appeared to have a tattoo? (use a two tailed test with an alpha of .05) Yes or no?

Compute Cohen's d to measure the size of the effect.