In: Statistics and Probability
A soft-drink bottling company maintains records of the number of unacceptable bottles obtained from its two filling and capping machines. A trial inspection of a production run of 1000 bottles showed that 430 came from Machine I and 570 from Machine II. Ten bottles from Machine I and 25 from Machine II were nonconforming.
(a) Use the above information to estimate the probabilities in the contingency table:
Conforming |
Nonconforming |
TOTAL |
|
Machine I |
|||
Machine II |
|||
TOTAL |
(b) What proportion of the total output is nonconforming?
(c) If a randomly-chosen bottle is found to be nonconforming, what is the probability that it was produced on Machine II?
(d) Which machine seems to be better? Calculate relevant probabilities and discuss.