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To monitor the manufacturing process of rubber support bearings used between the super- structure and foundation...

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Statistics

  1. To monitor the manufacturing process of rubber support bearingsused between the super- structure and foundation pads of nuclearpower plants, a quality control engineer randomly sampled 100bearings from the production line each day over a 15-day period.The bear- ings were inspected and the number of defects was found.The number of defects in your personalised data set are asfollows:

       1, 12, 3, 4, 4, 2, 4, 5, 4, 1, 9, 3, 3, 2, 2

    1. (a) Use R to plot the appropriate control chart to check if theproportion of non-conforming units was in control.

    2. (b) Using manual working, verify that the control limits arewhat you expect them to be.

    3. (c) Assuming the assignable cause of variations have been found,construct a control chart that can be used to monitor thenon-conforming proportion on future days of the process.

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