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# Statistical quality control - Colonel Electric

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Colonel Electric is a large company that produces lightbulbs and other electrical products. One particular lightbulb is supposed to have an average life of about 1,000 hours before it burns out. Periodically the company will test 5 of these and measure the average time before these burn out. The following table gives the results of 10 such samples:

Sample number 1 2 3 4 5 6 7 8 9 10
Mean 979 1087 1080 934 1072 1007 952 986 1063 958
Range 50 94 57 65 135 134 101 98 145 84

(a) What is the overall average of these means? What is the average range?

(b) What are the upper and lower control limits for a 99.7% control chart for the mean?

(c) Does this process appear to be in control? Explain.

The problem is in the attachment.

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## Statistical Quality Control: Colonel Electric

Colonel Electric is a large company that produces lightbulbs and other electrical products. One particular lightbulb is supposed to have an average life of about 1,000 hours before it burns out. Periodically the company will test 5 of these and measure the average time before these burn out. The following table gives the results of 10 such samples:

Sample Mean Range
1 979 50
2 1087 94
3 1080 57
4 934 65
5 1072 135
6 1007 134
7 952 101
8 986 98
9 1063 145
10 958 84

A) What is the overall average of these means?
B) What are the upper and lower control limits for a 99.7% control chart for the mean?
C) Does this process appear to be in control? Explain.
D) Develop upper and lower control limits for the range. Do these samples indicate that the process is in control?

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