Question: An in-line tester is used to evaluate the electrical function of printed circuit boards. This machine counts the number of defects observed on each board.

An in-line tester is used to evaluate the electrical function of printed circuit boards. This machine counts the number of defects observed on each board. A random sample of 1,000 boards contains a total of 688 defects. Is it reasonable to conclude that the mean occurrence rate of defects is  = 1. Use the results of part (a) of Exercise 4.26 and assume that  = 0.05.

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