In Order to Estimate the Average Electric Usage Per Month

question 32

Multiple Choice

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.

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