The following data were collected on nonconformances for a period of 10 days:
Day | Sample Size | Nonconformances |
1 | 111 | 12 |
2 | 93 | 14 |
3 | 105 | 10 |
4 | 92 | 18 |
5 | 117 | 22 |
6 | 88 | 14 |
7 | 117 | 15 |
8 | 87 | 13 |
9 | 119 | 14 |
10 | 107 | 16 |
a. On what day is the proportion of nonconformances largest? Smallest?
b. What are the LCL and UCL?
c. Are there any special causes of variation?
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