# Question: Use the following information x bar 50 15

Use the following information x-bar = 50, σ = 15, n = 90, N = 1,000--to calculate confidence intervals for assuming the sample is from a normal population:

(a) 90 percent confidence;

(b) 95 percent confidence;

(c) 99 percent confidence.

(a) 90 percent confidence;

(b) 95 percent confidence;

(c) 99 percent confidence.

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