# Question

Assume a normal distribution with known population variance. Calculate the width to estimate the population mean, m, for the following.

a. 90% confidence level; n = 100; σ2 = 169

b. 95% confidence level; n = 120; σ = 25

a. 90% confidence level; n = 100; σ2 = 169

b. 95% confidence level; n = 120; σ = 25

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