Find out if corrective action is needed

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Reference no: EM13109253

Q. Four samples of three observations each have been taken, with actual measurements (in centimetres) shown below. Construct three-sigma x-bar and R charts and find out if corrective action is needed. (Note: for x-bar chart analysis, do not compute the standard error term, simply use the control limit factor table to find out the UCL and LCL)

Sample
1: 12.3, 12.2, 12.1
2: 11.9, 12.2, 12.2
3: 12, 12.2, 11.8
4: 12.1, 11.8, 11.8

Reference no: EM13109253

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