Twenty samples have been taken from a production run. Given the following data, construct a 3-sigma p-chart and evaluate whether the process is in control.

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Sample Number Sample Size Number of Defectives 123456 200 38 200 26 200 37 200 42 200 48 200 45 7 200 38 8 200 42 9 200 46 10 200 45 11 200 32 12 200 37 13 200 38 14 200 37 15 200 36 16 200 39 17 200 50 18 200 39 19 200 38 20 200 36