To construct a p-chart for a manufacturing process, 25 samples of size 200 were drawn from the process. The number of defectives in each sample is listed below
![](https://test.transtutors.com/qimg/655a8ef6-4326-4595-b28f-d372926436d2.png)
a. Calculate the proportion defective in each sample.
b. Calculate and plot
and the upper and lower control limits for the p-chart.
c. Calculate and plot the A, B, and C zone boundaries on the p-chart.
d. Plot the sample proportions on the p-chart and connect them with straight lines.
e. Use the pattern-analysis rules 1-4 for detecting the presence of special causes of variation (Figure 11.21) to determine whether the process is out of control.