Measured at the lid center, the thickness of the zinc coating applied to container lids averages 3.000 mil, with a process standard deviation of 0.300 mil. Determine the centerline and the upper and lower control limits for a 3-sigma mean control chart in which each sample consists of 4 lids.
Answer to relevant QuestionsSamples of 12-volt batteries are taken at 30-minute intervals during a production run. Each sample consists of 3 batteries, and a technician records how long each battery will produce 400 amperes during a standard test. ...In the data collected for construction of a c-chart, the average number of defects per unit of output is c-bar = 7.5. What are the 3-sigma upper and lower control limits for the control chart? Using the control limits determined in Exercise 20.52, evaluate whether the process was in control when the following data were collected for vehicles 21–30. The data in file XR20061 represent 30 samples, each with n = 3 items measured in inches. For the associated mean and range charts, have your statistical software apply all of the diagnostic tests of which it is capable. Has ...In a production process for canvas, a sample consisting of 25 square feet contains 4 discolored spots that must be touched up before shipping. Data for this and subsequent samples, each consisting of 25 square feet of ...
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