Multiple Choice
In order to estimate the average electric usage per month, a sample of 64houses was selected and the electric usage was determined. Assume a population standard deviation of 320 kilowatt-hours. At 95% confidence, the size of the margin of error is
A) 1.96.
B) 40.00.
C) 78.40.
D) 65.80.
Correct Answer:
Verified
Correct Answer:
Verified
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