Question: Sample data collected by the operator of a lathe process on a part is shown below. The operator took a sample of four parts (

Sample data collected by the operator of a lathe process on a part is shown below. The operator took a sample of four parts (n = 4) at seven different points in time. The operator measured the outside diameter of each sampled part and listed the results in the table below. The design specification for this part is 1.250 inches + or - .005 inches.

Sample data collected by the operator of a lathe What is the value of A₂ that you would use in your calculation of an X-bar chart?

What is the value of D₄ that you would use in your calculation of a range chart?

Find UCL for the X-bar chart

Find UCL for the range chart

Find CL for the X-bar chart

Find CL for the range chart

Find LCL for the X-bar chart

Find LCL for the range chart

The process is in control with respect to X-bar. A. True B. False

The process is in control with respect to the range. A. True B. False

7 1 1.261 Samples Taken Over Seven Periods in Time Within Sample Size n = 4 2 3 4 5 6 1.259 1.239 1.225 1.259 1.255 1.263 1.265 1.249 1.243 1.273 1.247 1.26 1.265 1.242 1.245 1 2 3 1.253 1.251 1.281 1.239 1.245 4 1.249 1.240 1.257 1.248 1.257 1.268 1.245 ave. 1.252 1.252 1.255 1.247 1.250 1.260 1.254

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