Question: The data below represent precision length measurements of 80 consecutive structural frame members coming off the assembly line. Sample # 1 Sample # 11 2

The data below represent precision length

The data below represent precision length measurements of 80 consecutive structural frame members coming off the assembly line. Sample # 1 Sample # 11 2 12 3 13 4 14 5 x1 74.38 74.39 74.35 74.37 74.40 74.39 74.38 74.38 74.37 74.40 X2 74.34 74.38 74.39 74.40 74.35 74.34 74.34 74.34 74.35 74.38 x3 74.35 74.41 74.43 74.32 74.39 74.34 74.37 74.37 74.39 74.37 X4 74.40 74.37 74.41 74.37 74.39 74.38 74.39 74.38 74.38 74.39 15 x1 74.37 74.40 74.42 74.36 74.36 74.38 74.41 74.31 74.42 74.28 x2 x3 X4 74.37 74.41 74.37 74.37 74.39 74.33 74.37 74.35 74.41 74.38 74.40 74.42 74.36 74.30 74.34 74.34 74.34 74.36 74.45 74.42 74.38 74.29 74.40 74.51 74.33 74.40 74.28 74.34 74.28 74.45 6 16 7 8 9 10 17 18 19 20 a) Create and R charts from the given data. b) Is this process in control? c) Revise the and R charts so that only in-control points are used. Are all points still in control under the new control limits? Iterate this process if necessary to obtain acceptable control charts

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