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What is the difference in total call times?

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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?

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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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