Problem #7:

Given the following process data;

Sample	Obs 1	Obs 2	Obs 3	Obs 4	Avg	Range
1	10.68	10.7	10.776	10.798
2	10.79	10.9	10.601	10.746
3	10.78	10.667	10.838	10.785
4	10.59	10.727	10.812	10.81
5	10.69	10.708	10.79	10.758
6	10.75	10.714	10.738	10.719
7	10.79	10.713	10.689	10.877
8	10.74	10.779	10.11	10.737
9	10.77	10.88	10.641	10.644
10	10.72	10.671	10.708	10.85
11	10.79	10.821	10.764	10.658
12	10.62	10.802	10.818	10.872
13	10.66	10.822	10.893	11.222
14	10.81	10.749	10.859	10.801
15	10.66	10.681	10.644	10.747
				Averages

n	A2	D3	D4
2	1.88	0	3.27
3	1.02	0	2.57
4	0.73	0	2.28
5	0.58	0	2.11
6	0.48	0	2
7	0.42	0.08	1.92
8	0.37	0.14	1.86
9	0.34	0.18	1.82
10	0.31	0.22	1.78
11	0.29	0.26	1.74

A) Construct the most appropriate control chart and

B) Comment on whether or not the process is in statistical control