Question

The customer service department of a phone company is experimenting we frantsess Monday thay the w o o d is immediately connected with a live agent A quality control manag e s a sample of seven cleach day. He records theme for each customer to have his or her coint of varion for each of the two of the compare the writion Round resoonedecimal On Tuesday they by the second to answered. The times in minutes an in which achter below. Find the d A M Live agent 55 74 39 29 92 63 117 52 29 44413452 37 OA Automodern 48.8% 2 gent 263 There is wubstantially more awon themes for womedmeny OC. Atom Menu There is one for the OD o M 411

Answer 1

Coefficient of variation
We know that, coefficient ef variation is aiven by ev where sample mean Sample standard deviatiom 7 Foroautomated menu , 5.S47.39+ 2.9+9.2+6.3+11 7 A6 0/4 6.7 2-7(5- 67) (11--5.5) 55.62 5S-62-1)2 - 3.045 3.045 6.7 45.4% x100% CV Foeive agent, 6.2+2.0+ 4.4+ 4.1+3 4+5.2+31 4 271 /4 29

2 Z (x-(6-2-4-234)(3-4.21 3.7-4.271) 7594 /2 -1. 125 T50A 1) N1.1254.271 1007 26.3% There is substamtially Variation in the times fer the more Sys tem automatad menu
Thus B is the correct answer.