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Confidence intervals for the mean

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Reference no: EM13928773

Section 1: Confidence Intervals for the Mean (Large Samples)

Find the critical value zc necessary to form a confidence interval at the given level of confidence.
a. 90%
½ (1-.90) = 0.05 = 1.645

b. 80%
½ (1-.80) = 0.10 = 1.28

Reference no: EM13928773

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