Question: A quality analyst wants to construct a sample mean chart for controlling paper thickness. He knows from past experience that whenever this process is under

A quality analyst wants to construct a sample mean chart for controlling paper thickness. He knows from past experience that whenever this process is under control, paper thickness is normally distributed with a standard deviation of 2.5 mm. Each day last week, he randomly selected four sheets of paper measured each:

Sample	Thickness (mm)
Day 1	6	8	7	4
Day 2	5	5	5	6
Day 3	6	4	5	4

What are the x-bar chart three-sigma upper and lower control limits?

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