Do visible tattoos have an effect on physical attractiveness? To study this research question, Dr. Resenhoeft and colleagues (2008) used a sample of N = 36 students, who viewed a color photo of a woman WITH VISIBLE tattoos. This sample had M = 4.65 on the physical attractiveness rating scale. For the general population of students who viewed a color photo of a woman with NO VISIBLE tattoos, scores were = 4.90, = 0.84 on the physical attractiveness rating scale, which forms a normal distribution. Scores on the scale range from 0 (lowest possible attractiveness) to 6 (highest possible attractiveness).

a) Assuming a two-tailed test, state null hypothesis (H0) in a sentence AND statistical notation:

Assuming a two-tailed test, state research hypothesis (H1) in a sentence AND statistical notation:

b) Find the critical region (z) for 0.05 significance level, two-tailed:

c) Calculate M , , and M :

Calculate the z-score for the sample mean (M):

d) What decision should be made?

e) Please SUMMARIZE the results of the study in sentences:

f) Please INTERPRET the results of the study in a sentence(s