Control chart theory is based on the differences of the causes of variations in quality. Variations in quality may be produced by assignable causes. All of the following are examples of assignable causes except:

Related MCQs

• An acceptance control chart has limits that are based on the specification limits for the product rather than limits which differentiate between random and assignable causes. Under which if the following circumstance should a QC manager consider using an acceptance control chart?
• The concept of rational sub group means that subgroups or samples be selected such that if assignable causes are present the chances for differences between subgroups will be ______________.
• A project manager notices that all the measurements recorded on a control chart lie within the control band range. However, most of the measurements are below the midpoint (negative variance). Quality management practice offers us what guidance in dealing with this situation?
• If data for MR chat shows non-normality, it is better to determine the control limits for the individuals control chart based on the ______________ of the correct underlying distribution.
• The g chart is the control chart for:
• A major assumption for p chart is that all units produced are ______________.
• An assignable variance tells us:
• For a point in the control chart to be out of control, it must lie
• Control chart is i. Process monitoring tool ii. Process control tool iii. Process planning tool The correct order is
• You are sampling items from a batch and plotting the results on a control chart. How will an increase in the number of items sample affect the value of the standard deviation used to set the control limit?