7.88 Light bulbs, again Refer to Exercise 7.86. During a given week the number of defective bulbs...

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7.88 Light bulbs, again Refer to Exercise 7.86. During a given week the number of defective bulbs in each of five samples of 100 were found to be 2, 4, 9, 7, and 11. Is there reason to believe that the production process has been producing an excessive proportion of defectives at any time during the week?

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