A problem with a phone line that prevents a customer from receiving or making calls is upsetting to both the customer and the telecommunications company. The file “Phone” contains samples of 20 problems reported to two different offices of a telecommunications company and the time toclear these problems (in minutes) from the customers’ lines:   Central Office I Time to Clear Problems (minutes) 1.48 1.75 0.78 2.85 0.52 1.60 4.15 3.97 1.48 3.10 1.02 0.53 0.93 1.60 0.80 1.05 6.32 3.93 5.45 0.97   Central Office II Time to Clear Problems (minutes) 7.55 3.75 0.10 1.10 0.60 0.52 3.30 2.10 0.58 4.02 3.75 0.65 1.92 0.60 1.53 4.23 0.08 1.48 1.65 0.72

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
icon
Related questions
Question

Table 10-2

 

A problem with a phone line that prevents a customer from receiving or making calls is upsetting to both the customer and the telecommunications company. The file “Phone” contains samples of 20 problems reported to two different offices of a telecommunications company and the time toclear these problems (in minutes) from the customers’ lines:

 

Central Office I Time to Clear Problems (minutes)

1.48 1.75 0.78 2.85 0.52 1.60 4.15 3.97 1.48 3.10

1.02 0.53 0.93 1.60 0.80 1.05 6.32 3.93 5.45 0.97

 

Central Office II Time to Clear Problems (minutes)

7.55 3.75 0.10 1.10 0.60 0.52 3.30 2.10 0.58 4.02

3.75 0.65 1.92 0.60 1.53 4.23 0.08 1.48 1.65 0.72

 

Assuming that the population variances from both offices are not equal, is there evidence of a difference in the mean waiting time between two offices? (Use a = 0.01)

▪ You may need to download file “Phone”.
Referring to Table 10-2, judging from the way the data were collected, which test would likely be most appropriate to employ?
 
Question 1 options:
 

1) 

Pooled-variance t test for the difference between two means
 

2) 

Separate-variance t test for the difference between two means
 

3) 

F test for the ratio of two variances
 

4) 

Paired test

 

City
Verizon AT&T
Atlanta
74
56
Austin
72
61
Boston
69
60
Chicago
73
55
Dallas-Fort Worth
76
65
Denver
72
56
Detroit
73
63
Houston
77
59
Kansas City
Los Angeles
74
66
73
56
Miami
74
61
Milwaukee
74
60
Minneapolis-St.Paul
New York
71
60
71
57
Philadelphia
71
63
Phoenix
76
62
San Diego
74
60
San Francisco
73
53
Seattle
72
59
St. Louis
73
64
67
|Tampa
Washington D. C.
73
71
60
Transcribed Image Text:City Verizon AT&T Atlanta 74 56 Austin 72 61 Boston 69 60 Chicago 73 55 Dallas-Fort Worth 76 65 Denver 72 56 Detroit 73 63 Houston 77 59 Kansas City Los Angeles 74 66 73 56 Miami 74 61 Milwaukee 74 60 Minneapolis-St.Paul New York 71 60 71 57 Philadelphia 71 63 Phoenix 76 62 San Diego 74 60 San Francisco 73 53 Seattle 72 59 St. Louis 73 64 67 |Tampa Washington D. C. 73 71 60
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 4 steps with 4 images

Blurred answer
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
Statistics
ISBN:
9781119256830
Author:
Amos Gilat
Publisher:
John Wiley & Sons Inc
Probability and Statistics for Engineering and th…
Probability and Statistics for Engineering and th…
Statistics
ISBN:
9781305251809
Author:
Jay L. Devore
Publisher:
Cengage Learning
Statistics for The Behavioral Sciences (MindTap C…
Statistics for The Behavioral Sciences (MindTap C…
Statistics
ISBN:
9781305504912
Author:
Frederick J Gravetter, Larry B. Wallnau
Publisher:
Cengage Learning
Elementary Statistics: Picturing the World (7th E…
Elementary Statistics: Picturing the World (7th E…
Statistics
ISBN:
9780134683416
Author:
Ron Larson, Betsy Farber
Publisher:
PEARSON
The Basic Practice of Statistics
The Basic Practice of Statistics
Statistics
ISBN:
9781319042578
Author:
David S. Moore, William I. Notz, Michael A. Fligner
Publisher:
W. H. Freeman
Introduction to the Practice of Statistics
Introduction to the Practice of Statistics
Statistics
ISBN:
9781319013387
Author:
David S. Moore, George P. McCabe, Bruce A. Craig
Publisher:
W. H. Freeman