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A quality analyst wants to construct a sample mean chart for controlling a packaging process. He knows from past experience that the process standard deviation is two ounces. Each day last week, he randomly selected four packages and weighed each. The data from that activity appears below.
Weight Day Package 1 Package 2 Package 3 Package 4Monday 23 22 23 24Tuesday 23 21 19 21Wednesday 20 19 20 21Thursday 18 19 20 19Friday 18 20 22 20
(a) Calculate upper and lower control limits for both sample means and ranges.
(b) Is this process in control? Explain--a simple Yes or No is insufficient.
(c) What additional steps should the quality assurance team take?
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