Question: An automatic sensor measures the diameter of holes in consecutive order. The results of measuring 25 holes are in the following table. (a) Using all

An automatic sensor measures the diameter of holes in consecutive order. The results of measuring 25 holes are in the following table.

Sample Diameter Sample Diameter 1 9.94 14 9.99 2 9.93 15 10.12 10.09 16 9.81 4 9.98 17 9.73 5 10.11 18 10.14 6. 9.99 19

(a) Using all the data, compute trial control limits for individual observations and moving-range charts. Construct the control chart and plot the data. Determine whether the process is in statistical control. If not, assume that assignable causes can be found to eliminate these samples and

revise the control limits.

(b) Estimate the process mean and standard deviation for the in-control process.

Sample Diameter Sample Diameter 1 9.94 14 9.99 2 9.93 15 10.12 10.09 16 9.81 4 9.98 17 9.73 5 10.11 18 10.14 6. 9.99 19 9.96 10.11 20 10.06 10.11 8. 9.84 21 9. 9.82 22 9.95 10 10.38 23 9.92 11 9.99 24 10.09 9.85 12 10.41 25 10.36 13

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