Three sigma x chart and the three sigma r-chart

Reference no: EM1390188

Auto pistons at Yongpin Zhou's plant in Shanghai are produced in a forging process, and the diameter is a critical factor that must be controlled. From sample sizes of 10 pistons produced each day, the mean and the range of this diameter have been as follows:

Day Mean(mm) Range(mm)
1 156.9 4.2
2 153.2 4.6
3 153.6 4.1
4 155.5 5.0
5 156.6 4.5

Construct the 3-sigma x-chart and the 3-sigma R-shart for this dimension, using the data observed in the table above.

Reference no: EM1390188

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