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Confidence Interval B1 -B1 Q1: Given that follows a t-distribution with n - 2 degrees of freedom, where , is the $2 SXX parameter to be estimated, both of , and S2 are random variables, and Sxx is not random. a) Show that the 100(1 - a)% confidence interval (in short, C.I.) for B, is $2 btin- 2, NR Sxx where b and s' are the respective actual values of By and $2. b) Use the result in part (Q1a) to determine the 93% C.I. for B, with n = 10, b = 3.4707, s? = 27.88896, and Sxx = 376