Mathematics, 26.11.2019 21:31, chinnellepug2149
In order to estimate the average electric usage per month, a sample of 81 houses was selected and the electric usage was determined. assume a population standard deviation of 450 kilowatt-hours. if the sample mean is 1858 kwh, the 95% confidence interval estimate of the population mean is
Answers: 1
) :
= sample mean.
= Two-tailed critical z-value 
= population standard deviation.
kilowatt-hours.
kilowatt-hours.
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