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What is the difference in total call times?

Call Center 1 Call Center 2
19.14 20.64
24.59 27.42
28.37 25.68
27.17 20.45
29.52 18.55
18.97 23.91
24.53 22.84
29.33 22.33
18.42 20.65
24.55 25.15
26.41 24.97
24.72 20.16
20.97 21.79
30.01 24.76
20.38 23.24
22.13 19.49
25.43 23.38
23.30 22.43
31.00 24.83
29.24 20.86
24.69 18.76
28.32 22.71
25.21 20.39
19.96 26.91
24.13 25.48
29.31 19.83
23.95 26.06
28.46 27.77
26.27 24.52
19.77 23.08

Our customers expect a call to be completed in 22 minutes. Using the data above, does either of our call centers meet this expectation with an alpha level of 0.05?

Solution Summary

This solution uses the data from the two call centers to determine whether the call is completed in less than 22 minutes.

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