# Question

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?

## Answer to relevant Questions

Consider 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, ...Post your question

0