# Question: Let X1 X2 Xn be a random sample

Let X1, X2, ... , Xn be a random sample of size n from the normal distribution N(μ, σ2). Calculate the expected length of a 95% confidence interval for μ, assuming that n = 5 and the variance is

(a) Known.

(b) Unknown.

(a) Known.

(b) Unknown.

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