Question quality controlten samples of size four were taken

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Reference no: EM13383003

Question (Quality Control):

Ten samples of size four were taken from a process, and their weights measured. The sample averages and sample ranges are in the following table. Construct and plot an X-bar and R-chart using these data. Is the process in control?

Sample	1	2	3	4	5	6	7	8	9	10
Mean	20.01	19.98	20.25	19.9	20.35	19.23	20.01	19.98	20.56	19.97
Range	0.45	0.67	0.3	0.3	0.36	0.49	0.53	0.4	0.95	0.79

Reference no: EM13383003

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