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a Compute di Xi Yi for each pair
(a) Compute di = Xi - Yi for each pair of data.
(b) Compute d-bar and sd.
(c) Test the hypothesis that µd ≠ 0 at the α = 0.01 level of signiﬁcance.
(d) Compute a 95% conﬁdence interval for the population mean difference md .
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