Frozen orange juice concentrate is packed in 6-oz cardboard cans. These
cans are formed on a machine by spinning them from cardboard stock and
attaching a metal bottom panel. A can is then inspected to determine
whether, when filled, the liquid could possible leak either on the side
seam or around the bottom joint. If this occurs a can is considered
nonconforming. The data were collected as 30 samples of 50 cans each at
half-hour intervals over a three-shift period in which the machine was in
continuous operation. From sample 15 used a new bacth of cardboard stock
was punt into production. Sample 23 was obtained when an inexperienced
operator was temporarily assigned to the machine. After the first 30
samples, a machine adjustment was made. Then further 24 samples were taken
from the process.
Format
A data frame with 54 observations on the following 4 variables:
sample
sample id
D
number of defectives
size
sample sizes
trial
trial samples (TRUE/FALSE)
References
Montgomery, D.C. (1991) Introduction to Statistical
Quality Control, 2nd ed, New York, John Wiley & Sons, pp. 152–155.