Question: A manufacturing process is monitored using x-bar and R charts. Ten samples of n=15 observations have been gathered with the following results. Using this data

A manufacturing process is monitored using x-bar and R charts. Ten samples of n=15 observations have been gathered with the following results. Using this data to establish control charts, what is the lower control limit for the R chart?

Sample Mean Range

1 21.63. 5.393

2 29.32 7.505

3 23.36 8.294

4 22.33 5.472

5 29.29 4.072

6 25.59 8.785

7 32.88 5.19

8 29.25 7.317

9 27.28. 8.418

10 30.73. 7.445

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