Question: To estimate the average electric usage per month, a sample of 64 houses was selected, and the electric usage was determined. Assume a population standard

To estimate the average electric usage per month, a sample of 64 houses was selected, and the electric usage was determined. Assume a population standard deviation of 320 kilowatt-hours. The sample mean is 1858 kWh. Use this data for Questions 14-15.

We wish to compute the 95% confidence interval estimate of the population mean. What is the margin of error?+

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