Determine the trial control limits for each chart

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Reference no: EM132220634

Twenty subgroups of size 5 are obtained for the purpose of determining trial control limits for an X- and an R-chart. The data are as follows.

Subgroup Subgroup

Number X R Number X R

1 23 5 11 26 5

2 22 3 12 21 4

3 24 2 13 22 4

4 20 4 14 20 4

5 18 3 15 23 3

6 17 4 16 21 6

7 24 4 17 20 5

8 10 3 18 18 4

9 16 5 19 15 3

10 20 4 20 17 2

(a) Determine the trial control limits for each chart.

(b) Explain why there are so many subgroup averages outside the control limits for the X-chart in spite of the fact that the averages do not vary greatly.

(d) Since the number of points outside the control limits on the X-chart is quite high relative to the number of points that are plotted, what might this suggest a

Reference no: EM132220634

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