Computing upper and lower control limits

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Reference no: EM13109063

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 4
Monday	23	22	23	24
Tuesday	23	21	19	21
Wednesday	20	19	20	21
Thursday	18	19	20	19
Friday	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.

Reference no: EM13109063

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