Table 6.1 Factors for Calculating Three-Sigma Limits for the -Chart and -Chart

question 108

Multiple Choice

Table 6.1
Factors for Calculating Three-Sigma Limits for the -chart and R-chart
Source: 1950 Manual on Quality Control of Materials,copyright
American Society for Testing Materials.Reprinted with permission.
-A milling operation has historically produced an average thickness of 0.005 inch with an average range of 0.0015 inch.Currently,the first three items from each batch of 20 are inspected.Use Table 6.1.What is the value of the UCL ?

• A)less than or equal to 0.00200
• B)greater than 0.00200 but less than or equal to 0.00399
• C)greater than 0.00399 but less than or equal to 0.00599
• D)greater than 0.00599

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