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
a. 1760 to 1956 kWh.
b. 1729 to 1987 kWh.
c. 1758 to 1958 kWh.
d. 1776 to 1940 kWh.
a
Business
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