PRINCIPLES OF SUPPLY CHAIN MANAGEMENT

Duff Gardens Amusement Park likes to track customer satisfaction levels. Over a course of 15 days, management asked a random sample of guests whether they were happy or unhappy with their overall experience. The sample results are shown below:

No. of

Sample unhappy

Sample Size guests

1 90 5

2 90 4

3 90 3

4 90 4

5 90 4

6 90 4

7 90 3

8 90 5

9 90 5

10 90 7

11 90 5

12 90 2

13 90 3

14 90 5

15 90 6

a. Set up the p chart required to track the proportion of dissatisfied guests. Round your p value to three decimal points (ex. - 0.067 = 6.7%)

b. ALSO, what should Duff Gardens do if a future sample falls above the UCL? Explain.