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Ten samples of 15 parts each were taken from an ongoing process to establish a p-chart for control. The samples and the number of defectives in each are shown in the following table.

Sample

n

# of defective items in sample 

1

15

3

2

15

1

3

15

1

4

15

1

5

15

0

6

15

2

7

15

0

8

15

3

9

15

1

10

15

3

If Z=1.96, what is the Upper Control Limit for this chart?                                                                                      

A blanket manufacturer buys cloth by the 100-yard roll from a supplier. For setting up a control chart to manage the irregularities (e.g., loose threads and tears), the following data were collected from a sample provided by the supplier.

 

Sample

Irregularities

1

3

2

5

3

2

4

6

5

5

6

4

7

6

8

3

9

4

10

5

If Z=2 what is the Lower Control Limit for this chart?

Formulas: Quiz 3

1

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