Question

A machine tool company wants to develop an X-chart and R-chart to control process
variability. The sample data collected for this process with ranges is shown in the following
table.

Observations (cm)
Sample k 1 2 3 4 5   
1    5.02 5.01 4.94 4.99 4.96
2 5.01 5.03 5.07 4.95 4.96
3 4.99 5.00 4.93 4 .92 4.99
4 5.03 4.91 5.01 4.98 4.89
5 4.95 4.92 5.03 5.05 5.01
6 4.97 5.06 5.06 4.96 5.03
7 5.05 5.01 5.10 4.96 4.99
8 5.09 5.10 5.00 4.99 5.08
9 5.14 5.10 4.99 5.08 5.09
10 5.01 4.98 5.08 5.07 4.99

Is this process in control? Compare the charts and describe your observations

Answer 1