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Significance levels, mean, z score, and standard deviation

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Fred wants to calculate the 98% confidence interval around the mean using the z-distribution. His sample of 64 items has a mean of 35 and a standard deviation of 6. The maximum error of estimate would be 0.218.

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Z = (X - mu)/Sigma
Z = (X - 35)/6
98% confidence interval
Maximum error of estimate = ...

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