Thefollowing data were collected on non-conformances
fora period of 10 days.
Day SampleSize Non-conformances
1 100 12
2 100 14
3 100 10
4 100 18
5 100 22
6 100 14
7 100 15
8 100 13
9 100 14
10 100 16
a. On what day isthe proportion of non-conformances largest? Day 5 smallest? Day 3
b. What are theLCL and UCL? Is there a formula for calculating this by hand?
c.Are there any special causes ofvariation? How do I answer this?
All calculations must be done by hand!
fora period of 10 days.
Day SampleSize Non-conformances
1 100 12
2 100 14
3 100 10
4 100 18
5 100 22
6 100 14
7 100 15
8 100 13
9 100 14
10 100 16
a. On what day isthe proportion of non-conformances largest? Day 5 smallest? Day 3
b. What are theLCL and UCL? Is there a formula for calculating this by hand?
c.Are there any special causes ofvariation? How do I answer this?
All calculations must be done by hand!