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Important information about t-statistic

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Nationwide, the average waiting time until electric utility customer service representative answers a call is 300 seconds per call. The Gigantic Kilowatt Energy Company took a sample of 35 calls and found that, on the average, they answered in 240 seconds per call with a standard deviation of 50. Can the company claim that they are faster than the average utility?

A) No, because -0.20 falls in the critical region
B) Yes, because -7.10 falls in the critical region
C) No, because -1.20 falls in the critical region
D) Yes, because -0.20 falls in the critical region

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The expert examines important information about t statistics for the Nationwide.

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