4. Observation Xi Y₁ 1 2 3 4 5 6 7 8 19.4 18.3 22.1 20.7 19.2 11.8 20.1 18.6 19.8 16.8 21.1 22.0 21.5 18.7 15.0 23.9 (a) Determine d¡ = X; - Y¡ for each pair of data. (b) Compute d and sa- (c) Test if pa 0 at the a = 0.01 level of significance. (d) Construct a 99% confidence interval about the population mean difference µd.

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