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For Problem 15-16, develop upper and lower con-trol limits for the range. Do these samples indicate that the process is in control?
In Problem 15-16, 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 suchsamples: |
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