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# Construct the confidence interval for the population mean .90 x overbar = 15.8 x=15.8, sigma = 3.

a 90% confidence interval for

90% Cl For n. using Nnrmal dist Sample Mean =E— 15.8 Pepulaticln Stanclarcl cleviaticIn = cr _ 3 Sample Size = n _ 55 Significance level = n: = 1— Cenficlence = 1 — 0.9 = 0.1 The Critical...