Nationwide, the average waiting time until electric utilitycustomer service repr
ID: 2913813 • Letter: N
Question
Nationwide, the average waiting time until electric utilitycustomer service representative answers a call is 300 seconds percall. The Gigantic Kilowatt Energy Company took a sample of 35calls and found that, on the average, they answered in 240 secondsper call with a standard deviation of 50. Can the companyclaim 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
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
Explanation / Answer
Nationwide,the average waiting time until electric utility customer servicerepresentative answers a call is 300 seconds per call. TheGigantic Kilowatt Energy Company took a sample of 35 calls andfound that, on the average, they answered in 240 seconds per callwith a standard deviation of 50. Can the company claim thatthey are faster than the average utility?
A)
No, because –0.20 falls in the critical region
B)
Yes,because –7.10 falls in the criticalregion
C)
No, because –1.20 falls in the critical region
D)
Yes, because –0.20 falls in the critical region
A)
No, because –0.20 falls in the critical region
B)
Yes,because –7.10 falls in the criticalregion
C)
No, because –1.20 falls in the critical region
D)
Yes, because –0.20 falls in the critical region
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