Research Scenario:

There has been some evidence in the past indicating that people with visible tattoos are viewed more negatively than people without visible tattoos. Researchers attempting to mimic this study in 2010 conducted a similar study. They first obtained overall ratings of attractiveness for a woman with no tattoos shown in a color photograph. On a 7-point scale, the woman received an average rating of = 4.9, and the distribution of ratings was normal with a standard deviation of = 0.84. They then modified the photo and added a tattoo of a butterfly on the woman's left arm. They showed this new photo to a sample of n = 16 students at a local community college. They asked the students to rate the attractiveness of the woman on the same 7-point scale. The average score for the photo with the tattoo was M = 4.2.

Research Question:

Do visible tattoos cause people to rate a person as being less attractive?

Set the Decision Criteria

1. Using an alpha level of .01 ( = .01) and a z-test.