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Basic Statistics for Business and Economics | 7th Edition | ISBN: 9780077384470 | Authors: Douglas Lind; William Marchal; Samuel Wathen
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National Muffler Company claims it will change your

Chapter 4, Problem 26E

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QUESTION:

Problem 26E

National Muffler Company claims it will change your muffler in less than 30 minutes. An investigative reporter for WTOL Channel 11 monitored 30 consecutive muffler changes at the National outlet on Liberty Street. The number of minutes to perform changes is reported below.

44

12

22

31

26

22

30

26

18

28

12

40

17

13

14

17

25

29

15

30

10

28

16

33

24

20

29

34

23

13

 

 

 

a. Develop a box plot for the time to change a muffler.

b. Does the distribution show any outliers?

c. Summarize your findings in a brief report.

Questions & Answers

QUESTION:

Problem 26E

National Muffler Company claims it will change your muffler in less than 30 minutes. An investigative reporter for WTOL Channel 11 monitored 30 consecutive muffler changes at the National outlet on Liberty Street. The number of minutes to perform changes is reported below.

44

12

22

31

26

22

30

26

18

28

12

40

17

13

14

17

25

29

15

30

10

28

16

33

24

20

29

34

23

13

 

 

 

a. Develop a box plot for the time to change a muffler.

b. Does the distribution show any outliers?

c. Summarize your findings in a brief report.

ANSWER:

Solution:

Step 1 of 4:

An investigative reporter for WTOL channel 11 monitored 30 consecutive muffler changes at the National outlet on Liberty Street.

44

12

22

31

26

22

30

26

18

28

12

40

17

13

14

17

25

29

15

30

10

28

16

33

24

20

29

34

23

13

 

 

 

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