Using the control limits determined in Exercise 20.49, evaluate whether the process was in control when the following data were collected for samples 21–32.
Answer to relevant QuestionsAfter the stamping operation, door panels are periodically selected for a detailed examination in which the number of surface scratches, dents, and other flaws are counted. During today’s production run, 20 panels were ...A process is in control and the results from a series of samples show the overall mean and standard deviation of all the units sampled to be x-double bar = 23.50 grams and s = 0.21 grams. The upper and lower specification ...A process has generated the output (in centimeters) listed in file XR20063. a. For a series of samples, each with n = 4, construct and interpret the x-bar and range charts for this process. Does it appear to be in ...The number of defective products in each of 40 samples taken from a production run are shown here. In each sample, 200 units were examined and classified as either good or defective, depending on whether dimensional ...At regular intervals during the last three work shifts, technicians at the Willard Bolt Company have taken a total of 40 samples, each with n 55 bolts. The measurement taken is the bolt diameter, in inches, and the data are ...
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