An integrated circuit is connected to its frame by five

Reference no: EM13633681

An integrated circuit is connected to its frame by five wires. Twenty-five samples of eight units were taken and the pull strength of one wire was measured. The data are in the accompanying file.

Sample	Xbar	R	s
1	9.99	0.28	0.09
2	10.02	0.43	0.13
3	10.1	0.16	0.05
4	9.9	0.26	0.09
5	9.92	0.22	0.07
6	10.05	0.4	0.15
7	9.97	0.08	0.03
8	9.93	0.48	0.15
9	10.01	0.25	0.09
10	9.87	0.29	0.1
11	9.9	0.39	0.14
12	9.97	0.27	0.08
13	10.02	0.2	0.07
14	9.99	0.37	0.13
15	9.99	0.2	0.06
16	10.04	0.26	0.09
17	10.07	0.23	0.07
18	10.04	0.35	0.12
19	9.95	0.25	0.09
20	9.98	0.15	0.06
21	9.98	0.3	0.1
22	10.02	0.14	0.06
23	9.94	0.24	0.07
24	10.04	0.13	0.04
25	10.04	0.24	0.07

(a) Compute the 3? limits for the R chart. Is the variance out of control

(b) On the basis of the Western Electric rules, is the process mean in control? If not, when is it first detected to be out of control?

Reference no: EM13633681

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