Question: To construct a p-chart, 20 samples of size 150 were drawn from a process. The proportion of defective items found in each of the samples

To construct a p-chart, 20 samples of size 150 were drawn from a process. The proportion of defective items found in each of the samples is listed in the next table.

a. Calculate and plot the centerline and the upper and lower control limits for the p-chart.
b. Calculate and plot the A, B, and C zone boundaries on the p-chart.
c. Plot the sample proportions on the p-chart.
d. Is the process under control? Explain.
e. Should the control limits and centerline of part a be used to monitor future process output? Explain.

Proportion Defective Proportion Defective Sample Sample 1 2 3 4 5 .03 .05 .10 .02 .08 .09 11 12 13 14 .07 .04 .06 .05 .07 .06 15 16 .08 .05 .07 .06 17 18 19 .07 .02 .05 .03 10

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