In Order to Estimate the Average Electric Usage Per Month

question 13

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.The standard error of the mean is

• A) 450.
• B) 81.
• C) 500.
• D) 50.

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