Multiple Choice
Exhibit 8-4
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.
-Refer to Exhibit 8-4. The standard error of the mean is
A) 450
B) 81
C) 500
D) 50
Correct Answer:
Verified
Correct Answer:
Verified
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