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 appear below Weight Day Package 1 Package 2 Package 3 Package 4 Monday 23 22 23 20 Tuesday 23 21 19 21 Wednesday 20 22 20 21 Thursday 18 19 20 17 Friday 18 20 22 22 (a) Calculate the mean of all sample means (b) Calculate upper and lower control limits that include 99 of the sample means (c) Based on the x bar chart, is this process in control

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Question: 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

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 appear below.

	Weight
Day	Package 1	Package 2	Package 3	Package 4
Monday	23	22	23	20
Tuesday	23	21	19	21
Wednesday	20	22	20	21
Thursday	18	19	20	17
Friday	18	20	22	22

(a) Calculate the mean of all sample means.

(b) Calculate upper and lower control limits that include 99% of the sample means.

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