What is the purpose of a control chart

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Reference no: EM13747463

Quality Control

1. Write a one-page essay (at most 12pts 1.5 space) on the pros and cons of push versus pull manufacturing systems.

2. What is the purpose of a control chart?

3. Briefly explain the purpose of each of the following control charts

a. X-bar

b. Range

c. p-chart

d. c-chart

4. The time spent in a local medical clinic is to be investigated. Historically, the process has had a standard deviation equal to .146. The means of 39 samples of n=14 are:

Sample

Mean

Sample

Mean

Sample

Mean

Sample

Mean

1

3.86

11

3.88

21

3.84

31

3.88

2

3.9

12

3.86

22

3.82

32

3.76

3

3.83

13

3.88

23

3.89

33

3.83

4

3.81

14

3.81

24

3.86

34

3.77

5

3.84

15

3.83

25

3.88

35

3.86

6

3.83

16

3.86

26

3.9

36

3.8

7

3.87

17

3.82

27

3.81

37

3.84

8

3.88

18

3.86

28

3.86

38

3.79

9

3.84

19

3.84

29

3.98

39

3.85

10

3.8

20

3.87

30

3.96

   

a) Construct an x bar-chart for this process with three-sigma limits. Is the process in control?

b) Analyze the data using a median run test and an up/down run test. What can you conclude?

Reference no: EM13747463

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