Question: An automatic screw machine produces hex nuts. If a hex nut does not meet the quality standard, it is considered as defective. Samples of 200

An automatic screw machine produces hex nuts. If

An automatic screw machine produces hex nuts. If a hex nut does not meet the quality standard, it is considered as defective. Samples of 200 hex nuts each were taken to monitor the production. The number of defective hex nuts from the past 13 samples is listed below. Construct an appropriate control chart and determine whether or not the process is in control. (Hint: The quality here is measured by defective rate. Use the data in the table to construct respective control charts and plot the same data on the charts constructed.) Sample 1 2 3 4 5 6 7 8 9 10 11 12 13 # of defectives 12 24 24 212 10 3 2 1

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