Use a t-distribution to find a confidence interval for the difference in means using the relevant sample results from paired data. Assume the results come from random samples from populations that are approximately normally distributed, and that differences are computed using d= x1-x2 A 99% confidence interval for using the paired data in the following table:

Case 1 2 3 4 5
Treatment 1 21 28 31 25 27
Treatment 2 19 31 24 20 22

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