Question

A magazine provided overall customer satisfaction scores for AT&T, Sprint, T-Mobile, and Verizon cell-phone services in major metropolitan areas throughout the United States. The rating for each service reflects the overall customer satisfaction considering a variety of factors such as cost, connectivity problems, dropped calls, static interference, and customer support. A satisfaction scale from 0 to 100 was used with  indicating 0 completely dissatisfied and 100 indicating completely satisfied. The ratings for the four cell-phone services in 20 metropolitan areas are as shown.

Metropolitan Area	AT&T	Sprint	T-Mobile	Verizon
Atlanta	70	63	77	80
Boston	69	61	80	77
Chicago	71	62	76	78
Dallas	75	62	80	79
Denver	71	64	79	78
Detroit	73	62	83	80
Jacksonville	73	61	81	82
Las Vegas	72	65	80	82
Los Angeles	66	62	74	79
Miami	68	66	79	81
Minneapolis	68	63	81	78
Philadelphia	72	63	77	79
Phoenix	68	63	82	82
San Antonio	75	62	81	81
San Diego	69	65	78	80
San Francisco	66	66	79	76
Seattle	68	64	80	78
St. Louis	74	63	80	80
Tampa	73	60	79	80
Washington	72	65	77	77

a. Consider T-Mobile first. What is the median rating (to 1 decimal)?

b. Develop a five-number summary for the T-Mobile service.

Smallest value
First quartile (to 2 decimals)
Median (to 1 decimal)
Third quartile (to 2 decimals)
Largest value

c. Are there outliers for T-Mobile? Explain.

All ratings are between     and   .

- Select your answer -Yes, the data contain outliersNo, the data do not contain outliersItem 9

d. Repeat parts (b) and (c) for the other three cell-phone services.

	AT&T	Sprint	Verizon
Smallest value
First quartile (to 2 decimals)
Median (to 1 decimal)
Third quartile (to 2 decimals)
Largest value

Are there outliers for AT&T? Explain.

Limits for AT&T(to 1 decimal)     and  

- Select your answer -Yes, the data contain outliersNo, the data do not contain outliersItem 27

Are there outliers for Sprint? Explain.

Limits for Sprint(to 2 decimals)     and  

- Select your answer -Yes, the data contain outliersNo, the data do not contain outliersItem 30

Are there outliers for Verizon? Explain.

Limits for Verizon(to 2 decimals)     and  

- Select your answer -Yes, the data contain outliersNo, the data do not contain outliersItem 33

e. Which of the following box plots accurately displays the data set?

#1		#2
#3		#4

- Select your answer -Box plot #1Box plot #2Box plot #3Box plot #4Item 34

Which service did the magazine recommend as being best in terms of overall customer satisfaction?

- Select your answer -AT&TSprintT-MobileVerizonItem 35

Discuss what a comparison of the box plots tells about the four services.

- Select your answer -AT&T’sSprint’sT-Mobile’sVerizon’sItem 36  lowest rating is better than the highest - Select your answer -AT&T and SprintAT&T and VerizonSprint and VerizonT-Mobile and VerizonItem 37  ratings and is better than of the - Select your answer -AT&TSprintT-MobileVerizonItem 38 ratings. - Select your answer -AT&TSprintT-MobileVerizonItem 39  shows the lowest customer satisfaction ratings among the four services.

Answer 1

Note : Answer the first four question.

Five number summary AT&T  

Five number summary Sprint  

Five number summary T-Mobile  

Five number summary Verizon