An acceptance control chart has limits that are based on the spec. limits for the product rather than limits which differentiate between random and assignable causes. Under which of the following circumstances should a QC manager consider this type chartA . When the engineering tolerance on a dimension greatly exceeds the natural dispersion of the manufacturing processB . When the number of samples outside the current control chart limits become too costly and cumbersome to investigate.C . When a process is subject to constant but stable tool wear.D . A and B.E . A and C
An acceptance control chart has limits that are based on the spec. limits for the product rather than limits which differentiate between random and assignable causes. Under which of the following circumstances should a QC manager consider this type chart
A . When the engineering tolerance on a dimension greatly exceeds the natural dispersion of the manufacturing process
B . When the number of samples outside the current control chart limits become too costly and cumbersome to investigate.
C . When a process is subject to constant but stable tool wear.
D . A and B.
E . A and C
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