Question: A tire manufacturer has been concerned about the number of defective tires found recently. In order to evaluate the true magnitude of the problem, a

A tire manufacturer has been concerned about the number of defective tires found recently. In order to evaluate the true magnitude of the problem, a production manager selected 10 random samples of 20 units each for inspection. The number of defective tires found in each sample are as follows:

(a) Develop a p-chart with a z = 3.
(b) Suppose that the next four samples selected had 6, 3, 3, and 4 defects. What conclusion can youmake?

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