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(Solved) Sampling 4 pieces of precision-cut wire (to be used in computer assembly) every hour for the past 24 hours has produced the following results.

Question: Sampling 4 pieces of precision-cut wire (to be used in computer assembly) every hour for the past 24 hours has produced the following results. Develop appropriate control charts and determine whether there is any cause for concern in the cutting process.

Hour X R
1 3.25 0.71
2 3.10 1.18
3 3.22 1.43
4 3.39 1.26
5 3.07 1.17
6 2.86 0.32
7 3.05 0.53
8 2.65 1.13
9 3.02 0.71
10 2.85 1.33
11 2.83 1.17
12 2.97 0.40
13 3.11 0.85
14 2.83 1.31
15 3.12 1.06
16 2.84 0.50
17 2.86 1.43
18 2.74 1.29
19 3.41 1.61
20 2.89 1.09
21 2.65 1.08
22 3.28 0.46
23 2.94 1.58
24 2.64 1.97

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Solution: The downloadable solution consists of 3 pages
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