Question: Omm Lecture Exercise #11 TABLE 56.1 Factors for Computing Control Chart Limits (3 sigma) SAMPLE SIZE, MEAN FACTOR, UPPER RANGE, LOWER RANGE, n A2 D

Omm Lecture Exercise #11 TABLE 56.1 Factors for

Omm Lecture Exercise #11 TABLE 56.1 Factors for Computing Control Chart Limits (3 sigma) SAMPLE SIZE, MEAN FACTOR, UPPER RANGE, LOWER RANGE, n A2 D D 2 1.880 3.268 0 3 1.023 2.574 0 4 .729 2.282 0 5 .577 2.115 0 6 .483 2.004 0 7 .419 1.924 1.864 0.076 0.136 8 .373 9 .337 1.816 0.184 10 .308 1.777 0.223 12 .266 1.716 0.284 We wish to determine if screw production is in statistical control. We have no prior information, other than the 5 samples (where each sample has 4 observations) Number 2 3 4 Sample 1 0.5014 0.5022 0.5009 0.5027 Sample 2 0.5021 0.5041 0.5032 0.5020 Sample 3 0.5018 0.5026 0.5035 0.5023 Sample 4 0.5008 0.5034 0.5024 0.5015 Sample 5 0.5041 0.5056 0.5034 0.5039 1 1. Compute the sample range and mean for each of the 5 samples. 2. Compute x , the average of the sample means, and R , the average of the sample ranges. 3. Construct the X. chart to check if the sample mean is in control 4. Construct the Range chart to check if process variation is in control

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