Colding Industries has decided to use a p-Chart to monitor the proportion of defective galvanized pipes produced by their production process. The control limits on these charts will be designed to include 95% of the sample proportions when the process is In Control. The quality control manager randomly samples 150 galvanized pipes at 16 successively selected time periods and counts the number of defective galvanized pipes in the sample. 1.What is the Center Line of the control chart? Round to three decimal places. 2.What is the z-value associated with the level of significance stated in the problem? Round to two decimal places.
Colding Industries has decided to use a p-Chart to monitor the proportion of defective galvanized pipes produced by their production process. The control limits on these charts will be designed to include 95% of the sample proportions when the process is In Control. The quality control manager randomly samples 150 galvanized pipes at 16 successively selected time periods and counts the number of defective galvanized pipes in the sample.
1.What is the Center Line of the control chart? Round to three decimal places.
2.What is the z-value associated with the level of significance stated in the problem? Round to two decimal places.
3.What is the Upper Control Limit? Round to three decimal places.
4.What is the Lower Control Limit? Round to three decimal places.
5.At the next time period, 150 galvanized pipes are sampled and 8 defective galvanized pipes are detected. Is this instance out of control or in control?
6.At the next time period, 150 galvanized pipes are sampled and 15 defective galvanized pipes are detected. Is this instance out of control or in control?
7.At the next time period, 150 galvanized pipes are sampled and 25 defective galvanized pipes are detected. Is this instance out of control or in control?
8.You, acting as the quality control manager, have concluded that the process is "Out of Control". What is the probability that the process is really "In Control" and you have made a Type I Error? Round to three decimal places.
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