7.63 Brass Rivets A producer of brass rivets randomly samples 400 rivets each hour and calculates the

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7.63 Brass Rivets A producer of brass rivets randomly samples 400 rivets each hour and calculates the proportion of defectives in the sample. The mean sample proportion calculated from 200 samples was equal to 0.021. Construct a control chart for the propor- tion of defectives in samples of 400 rivets. Explain how the control chart can be of value to a manager.

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