Question: Let l = y = o , + 1 x 1 + 2 x 2 , ... k x k .

Let l = ŷ = β̂_o, + β̂₁x₁ + β̂₂x₂, ... β̂_kx_k. Use the T statistic of Exercise 11.13, in conjunction with the pivotal method, to derive the formula for a (1 - α)100% confidence interval for E(y).

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