Question: Discuss the logic underlying the use of three sigma limits on
Discuss the logic underlying the use of three-sigma limits on Shewhart control charts. How will the chart respond if narrower limits are chosen? How will it respond if wider limits are chosen?
Relevant QuestionsConsider the control chart shown here. Does the pattern appear random? Construct a normal probability plot of the failure time data in Exercise 4.6. Does the assumption that failure time for this component is well modeled by a normal distribution seem reasonable? Suppose that two fair dice are tossed and the sum of the dice is observed. Determine the probability distribution of , the sum of the dice. The specifications on an electronic component in a target-acquisition system are that its life must be between 5,000 and 10,000 h. The life is normally distributed with mean 7,500 h. The manufacturer realized a price of $10 ...The output voltage of a power supply is assumed to be normally distributed. Sixteen observations taken at random on voltage are as follows: 10.35, 9.30, 10.00, 9.96, 11.65, 12.00, 11.25, 9.58, 11.54, 9.95, 10.28, 8.37, ...
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