Nationwide, the Average Waiting Time Until a Electric Utility Customer

Multiple Choice

Nationwide, the average waiting time until a electric utility customer service representative answers a call is 310 seconds. The Gigantic Kilowatt Energy Company
Randomly sampled 40 calls and found that, on average, they were answered in 287
Seconds with a population standard deviation of 30 seconds. Can the company claim that
They are faster than the average utility at α = 0.05?

A) Yes, because the test value -0.12 falls in the critical region.
B) Yes, because the test value -4.85 falls in the critical region.
C) No, because the test value -0.12 falls in the critical region.
D) No, because the test value -0.77 falls in the critical region.