The following data are from a production process that makes 250 units each hour. The data were collected over a normal 12-hour shift one day. The data are shown in the table at the right. Using the first 10 hours as the calibration period,

a)€‚Calculate the center line of the p chart.
b)€‚Calculate the upper control limit of the p chart.
c)€‚Calculate the lower control limit of the p chart.
d)€‚Create a p chart for the samples from the second set of 10 hours.
e)€‚Is this process out of control?

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Hour No. of Defects Sample Size 250 250 250 250 250 250 250 250 250 250 250 250 250 250 15 12 20 19 14 14 10 16 19 12 13 14 15 16 17 18 19 20 250 18 250 250 250 250 250 19