Ten samples of 15 parts each were taken from an ongoing process to establish a p-chart for control. The samples and the number of defectives in each are shown in the following table:

a. Develop a p-chart for 95 percent confidence.

b. Based on the plotted data points, what comments can you make?

Sample n 123 45 55555 15 15 15 15 15 Number of defective items in the sample 3 1 0 OOO 0 0 Sample n 6 15 7 8 9 10 insis is 15 15 15 15 Number of defective items in the sample 2 0 3 1 0