If the standard deviation of all pumps ? is also unknown, compute a 95% confidence interval for ? if the average for randomly selected 20 heat pumps is 4.85 with s = 1.2.Also, if the standard deviation of all pumps ? is unknown, is there an easier formula to estimate the sample size to control the width of the confidence interval? Please explain it.
This question was answered on: May 23, 2022
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