Construct the appropriate control chart

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Reference no: EM13537602

Question: Workers at a packaging operation shovels a granular product from a large pile into sacks that are then sealed and placed on pallets for shipping. A sequence of 25 subgroups each consisting of the weights of 5 sacks has been recorded as follows:

 

Observations

Subgroup #

Sack 1

Sack 2

Sack 3

Sack 4

Sack 5

1

35.4

35.6

34.8

34.7

34.8

2

36

35.6

34.9

34.8

35.9

3

35.2

35

35

35.4

35.1

4

34.8

35.8

35.2

35

34.9

5

34.2

35

36.1

34.9

35.1

6

36

35

35.2

34.8

34.9

7

36.1

34.9

34.5

35

35.1

8

35.1

35

35.6

34.9

36.2

9

35

35.6

36.1

34.8

35.6

10

35.4

35.8

36

34.2

36

11

35.2

35.3

35.2

35.9

34.8

12

35.9

36

35.1

35.1

35.6

13

35.2

35.6

35

34.9

35

14

35.2

35.6

35.8

35

35.1

15

34.9

34.8

35

35.2

34.9

16

35.2

35.3

35.2

35.6

35.1

17

35.6

35.8

35.2

35.4

34.9

18

35.2

35.6

35.4

35.6

35.2

19

34.7

34.9

35.6

35.2

35

20

35

35.1

35.6

35

35.1

21

35.6

35

35.8

35.2

34.6

22

34.9

35.1

35.6

35

35.2

23

35.9

36

35.2

36

35.2

24

35.2

35.1

35.4

34.9

35.1

25

35.2

35.2

35.1

35.6

34.9

a- What is the appropriate control chart that can be used by the quality engineer in this case?

b- Determine the control limits (show your calculations)

c- Construct the appropriate control chart for the data above using MINITAB.

d- Is the process in-control? If not, when does the out-of-control behavior occur?

e- If the process is found to be out of control, drop the out-of-control points and use MINITAB to re-construct the control chart.

f-  Is the process now in-control? If not, what to do next?

Reference no: EM13537602

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