A study was done on proctored and nonproctored tests. The results are shown in the table. Assume that the two samples are independent simple random samples selected from normally distributed populations, and do not assume that the population standard deviations are equal. Complete parts (a) and (b) below. Proctored Nonproctored mu mu 1 mu 2 n 35 32 x overbar 74.75 85.29 s 10.48 21.68 Question content area bottom Part 1 a. Use a 0.05 significance level to test the claim that students taking nonproctored tests get a higher mean score than those taking proctored tests. What are the null and alternative hypotheses? A. Upper H 0: mu 1equalsmu 2 Upper H 1: mu 1not equalsmu 2 B. Upper H 0: mu 1not equalsmu 2 Upper H 1: mu 1less thanmu 2 C. Upper H 0: mu 1equalsmu 2 Upper H 1: mu 1greater thanmu 2 D. Upper H 0: mu 1equalsmu 2 Upper H 1: mu 1less thanmu 2