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	Mean	Range
1	20.01	0.45
2	19.98	0.67
3	20.25	0.30
4	19.90	0.30
5	20.35	0.36
6	19.23	0.49
7	20.01	0.53
8	19.98	0.40
9	20.56	0.95
10	19.97	0.79

 

Transcribed Image Text:

TABLE 56.1 SAMPLE SIZE, n 2 3 4 6 7 8 10 12 Factors for Computing Control Chart Limits (3 sigma) MEAN FACTOR, A UPPER RANGE, D 1.880 3.268 1.023 2.574 729 2.282 577 2.115 483 2.004 419 1.924 373 1.864 337 1.816 308 1.777 266 1.716 LOWER RANGE, D, 0 0 O 0 0 0.076 0.136 0.184 0.223 0.284 TABLE 56.1 SAMPLE SIZE, n 2 3 4 6 7 8 10 12 Factors for Computing Control Chart Limits (3 sigma) MEAN FACTOR, A UPPER RANGE, D 1.880 3.268 1.023 2.574 729 2.282 577 2.115 483 2.004 419 1.924 373 1.864 337 1.816 308 1.777 266 1.716 LOWER RANGE, D, 0 0 O 0 0 0.076 0.136 0.184 0.223 0.284

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Solution To plot RChart you will need to calculate R central line it is ... View the full answer