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A quality analyst desires to develop the sample mean chart for controlling the packaging process. He knows from past experience which the procedure standard deviation is two ounces. Each day last week, he randomly chosen 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) Evaluate the upper and lower control limits for the both sample means and ranges.

b) Is this process in control? describe simple Yes or No is insufficient.

c) What additional steps must the quality assurance team capture?

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