Question: In a control chart application, we have found that the grand average over all the past samples of 6 units is X-Double Bar = 25

In a control chart application, we have found that the grand average over all the past samples of 6 units is X-Double Bar = 25 and R-Bar = 5.

a) Set up X-bar and R Control charts.

A2= 483 D3=0 D4=2.004

.483*5=2.415+25=27.415=UCL

.485*5=25-2.415=22.585=LCL

LCL(R bar)=0

UCL=10.020

b) The following measurements are taken from a new sample: 33, 37, 25, 35, 34 and 32. Is the process still in control?

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