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A researcher wanted to compare the pulse rates of identical twins to see whether there was any differ ence. Eight sets of twins were randomly

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A researcher wanted to compare the pulse rates of identical twins to see whether there was any differ ence. Eight sets of twins were randomly selected. The rates are given in the table as number of beats per minute. Find the 99% confidence interval for the difference of the two. Twin A 88 92 77 84 88 89 85 92 Twin B 83 94 79 84 85 92 80 85 O-3.1

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