In Order to Estimate the Average Electric Usage Per Month

question 77

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.At 95% confidence, the size of the margin of error is

• A) 1.96.
• B) 50.00.
• C) 98.00.
• D) 42.00.

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