Nationwide, the Average Waiting Time Until an Electric Utility Customer

question 40

Multiple Choice

Nationwide, the average waiting time until an electric utility customer service representative answers a call is 200 seconds per call. The Gigantic Kilowatt Energy Company took a sample of 40 calls and found
That, on the average, they answered in 140 seconds per call with a standard deviation of $30. Can the
Company claim that they are faster than the average utility?

• A) Yes, because -12.65 falls in the critical region
• B) No, because -2.00 falls in the critical region
• C) Yes, because -0.32 falls in the noncritical region
• D) No, because -0.32 falls in the critical region

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