Instructions:
A production process for the JMF Semicon is monitored. Ten (10) samples of n = 15 observations have been collected with the following results:
Sample
Mean
Range
1
251
29
2
258
45
3
233
36
4
275
25
5
234
35
6
289
20
7
256
3
8
265
19
9
246
14
10
323
46
a. Develop the appropriate control chart and complete the means and the range charts.
b. Is the process under control? Explain.
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