Question: Problem 7.8 Suppose that X1,...,X25 is a random sample from a normal population N(, 2) and that x = 148.30. (a) Assume = 4;

Problem 7.8 Suppose that X1,...,X25 is a random sample from a normal population N(µ, σ2) and that x = 148.30.

(a) Assume σ = 4; find a 95% confidence interval for µ.

(b) Assuming s = 4, i.e., σ2 is unknown, obtain a 95% confidence interval for µ.

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