Question: 1. A quality analyst wants to construct a sample mean chart for controlling a packaging process. He knows from past experience that the process standard

1. 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 2 ounces. Each day last week, he randomly selected four packages and weighed each. The data from that activity appears below.

a) Calculate all sample means, the mean of all sample means, sample range, and the mean range.

(b)Calculate upper and lower control limits for x-bar chart and R chart that allow for natural variations.

(c)Is this process in control?

	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

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