Exam 4: Statistical Process Control

Special cause (nonrandom)variation in a process is more likely to be detected with

Pizazz manufactures a 5.0 oz.energy drink of the same name.Because the cans are so small,consumers are concerned that they are not receiving the full 5 ounces in each can.A quality engineer at the company is charged with analyzing the filling process and ensuring accurate readings.On 15 different occasions over the past month,she has taken a sample of 6 energy drinks off the production line and recorded their weight.If the sum of the sample means is 80.20 ounces and the sum of the sample ranges is 12.68 ounces,the UCL for an R-chart of this process would be

One advantage of using a pattern test is that special cause variations may be identified before any points are plotted outside the control limits.