Four samples of three observations each have been taken, Ask an Expert

Management Studies

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

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