Ten randomly selected people took an iq test a, and next day they took a very similar iq test b. their scores are shown in the table below. person a b c d e f g h i j test a 106 99 95 92 87 127 115 100 77 108 test b 112 101 99 96 90 130 112 99 80 112 1. consider (test a - test b). use a 0.05 significance level to test the claim that people do better on the second test than they do on the first. (note: you may wish to use software.) (a) what test method should be used? a. two sample t b. two sample z c. matched pairs (b) the test statistic is (c) the critical value is (d) is there sufficient evidence to support the claim that people do better on the second test? a. yes b. no 2. construct a 95% confidence interval for the mean of the differences. again, use (test a - test b). < μ