Control chart for proportion of dissatisfied customers

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Reference no: EM131384721

Refer to given Exercise. Management believes that the dissatisfaction rate is 3%, so establish control limits based on this value. Comment on the ability of the store to meet this standard. If management were to set the standard at 2%, can the store meet this goal? What actions would you recommend?

Exercise
The number of customers who are not satisfied with the service provided in a retail store is found for 20 samples of size 100 and is shown in given Table. Construct a control chart for the proportion of dissatisfied customers. Revise the control limits, assuming special causes for points outside the control limits.

Sample

Number of dissatisfied customers

Sample

Number of dissatisfied customers

1

2

11

5

2

5

12

4

3

4

13

2

4

3

14

5

5

4

15

3

6

2

16

12

7

3

17

3

8

2

18

2

9

4

19

5

10

11

20

2

Reference no: EM131384721

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