1. a) Two different schools create their own versions of the same aptitude test, and a Department Chair administers both versions to the same randomly selected subjects with the results given below. At the .01 level of significance, test the claim that both versions produce the same mean. TestB(before) 109 118 104 127 126 99 104 108 113 TestC(after) 102 115 107 116 104 91 113 112 112 Did you subtract before - after or after - before? claim . . . . .. null hypothesis..... alternative hypothesis......... . . . . . ............ Calculator Screen Name......... . . . . . ..... test statistic . . . . . . . ...... pvalue/alpha comparison................ ....... decision Conclusion . . . . . .... b) Construct a 99% confidence interval for, Ma . Interpret interval in a sentence. Confidence Interval Name Interval Interpret