Five batteries were taken in each sample to measure how long (in hours) every battery will last. The inspection team randomly picked samples every two hours during the day. The data for four samples is shown in the following table.     Please help the inspection team construct appropriate control limits using 3-sigma to monitor the quality of battery life (keep two decimal places if necessary). Which of the following statements is FALSE based on the control limits?   Select one: a. More than one control charts can be used. b. The process is in control. c. The sample size is 5. d. One of the control limits is 40.71. e. If every battery is designed to have an average life of 60 hours, the process is still in control.

Practical Management Science
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Author:WINSTON, Wayne L.
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5. 

Five batteries were taken in each sample to measure how long (in hours) every battery will last. The inspection team randomly picked samples every two hours during the day. The data for four samples is shown in the following table.


 

 

Please help the inspection team construct appropriate control limits using 3-sigma to monitor the quality of battery life (keep two decimal places if necessary).

Which of the following statements is FALSE based on the control limits?


 

Select one:
a.

More than one control charts can be used.

b.

The process is in control.

c.

The sample size is 5.

d.
One of the control limits is 40.71.
e.

If every battery is designed to have an average life of 60 hours, the process is still in control.

1
2
34
4
5
hour 1 hour 3 hour 5 hour 7
48
45
63
45
53
49
38
48
50
46
46
45
54
66
53
52
52
39
57
61
Transcribed Image Text:1 2 34 4 5 hour 1 hour 3 hour 5 hour 7 48 45 63 45 53 49 38 48 50 46 46 45 54 66 53 52 52 39 57 61
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