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.
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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