In Order to Estimate the Average Electric Usage Per Month

question 61

Multiple Choice

In order 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 standard error of the mean is

• A) 320.
• B) 64.
• C) 400.
• D) 40.

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