Pulsed laser deposition technique is a thin film deposition technique with a high-powered laser beam. Twenty-five films were deposited through this technique. The thicknesses of the films obtained are shown in the following table.

(a) Using all the data, compute trial control limits for individual observations and moving-range charts. 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.

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Film Thickness (nm) Film Thickness (nm) 1 28 51 2 45 23 3 34 10 35 4 29 11 47 50 37 12 52 13 32 29 14 40 15 46 21 21 16 59 22 62 17 20 23 34 18 33 24 31 19 56 25 98 20 49