Ten samples of 15 parts each were taken from an ongoing process to establish a pchart for control. The samples and the number of defectives in
each are shown in the following table:
Number of
Number of
Defective Items
Defective Items
Sample
n
in the Sample
Sample
n
in the Sample
1
15
3
6
15
2
2
15
1
7
15
0
3
15
0
8
15
3
4
15
0
9
15
1
5
15
0
10
15
0
a. Develop a p -chart for 95 percent confi dence (1.96 standard deviation).
b. Based on the plotted data points what comments can you make?