Ten randomly selected people took an IQ test A, and the 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 89 76 106 100 87 95 96 123 113 112 Test B 92 79 106 104 89 99 95 126 117 116 Use a 0.01 significance level (a) What is the Test-Statistic? ________ (b) construct a 99% confidence interval for the mean of the differences. (again use tests A and B) ___________ < u < __________

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