Surface defects have been counted on 25 rectangular steel plates, and the data are shown in the following table. Set up a control chart for nonconformities using these data. Does the process producing the plates appear to be in statistical control?

plate #	# of nonconformities	plate #	# of nonconformities
1	1	14	0
2	0	15	2
3	4	16	1
4	3	17	3
5	1	18	5
6	2	19	4
7	5	20	6
8	0	21	3
9	2	22	1
10	1	23	0
11	1	24	2
12	0	25	4
13	8

a) What type of control chart would you use to monitor this process and why? b) Set up a control chart for nonconformities using these data(i.e.calculate the 3-sigma control limits and draw the control chart using Excel). Does the process producing the plates appear to be in statistical control? Explain.