Question: You want to develop 3 sigma level process control charts to monitor the weight of boxes that contain trash. Due to different content of trash,

You want to develop 3 sigma level process control charts to monitor the weight of boxes that contain trash. Due to different content of trash, weights are varying. You performed 4 samplings. Each time, they measured 3 boxes (n = 3). Draw control charts (you will have to choose proper control chart) and make conclusion whether things are under control.

Sampling 1

Sampling 2

Sampling 3

Sampling 4

20

28

24

28

24

30

28

20

26

24

26

26

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