The appropriate statistical test for whether the mean rating of guilts are greater for unattractive defendants than for attractive is:
B. 1 tailed t-test.
At the null hypothesis, it is tested if the mean rating of guilt will not be higher for unattractive defendants than for attractive defendants, that is:
[tex]H_0: \mu_U \leq \mu_A[/tex]
At the alternative hypothesis, it is tested if the rating is greater, that is:
[tex]H_1: \mu_U > \mu_A[/tex]
We are comparing the means, hence a t-test is used. We are testing if one is greater than other(not different), hence a 1-tailed test is used, and option B is correct.
More can be learned about hypothesis tests at https://brainly.com/question/13873630
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