Question: Given the following process control data for a normally distributed quality variable (three samples of size four each): Machine Measurements #1 15 14 15 12
Given the following process control data for a normally distributed quality variable (three samples of size four each): Machine Measurements #1 15 14 15 12 #2 18 16 20 16 #3 16 17 16 17
If the process is known to have a mean of 15 and a standard deviation of 3, what are the three sigma upper and lower control limits for an x-bar chart?
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