Multiple Choice
A study has indicated that the sample size necessary to estimate the average electricity use by residential customers of a large western utility company is 900 customers. Assuming that the margin of error associated with the estimate will be ±30 watts and the confidence level is stated to be 90 percent, what was the value for the population standard deviation?
A) 265 watts
B) Approximately 547.1 watts
C) About 490 watts
D) Can't be determined without knowing the size of the population.
Correct Answer:
Verified
Correct Answer:
Verified
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