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Average for randomly selected

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Reference no: EM131094195

Compute a 99% confidence interval for μ if the average for randomly selected 20 heat pumps is 4.85 and the standard deviation of all heat pumps is known to be 0.75.

Also, how large a sample size is necessary to estimate true mean μ to within 0.2 with 99% confidence?

Reference no: EM131094195

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