The producers of the Yugo automobile periodically inspect samples of 80 hoods for dents and scratches. A single flaw in a hood renders it unsuitable for installation in one of their fine automobiles. The results of the last 10 samples are shown.. What are the lower and upper control limits for the np chart?
A) (-8.35, 2.8)
B) (2.8, 8.35)
C) (0.3, 17.1)
D) (8.7, 17.1)
E) (0.4, 8.7)

Question

Quizplus · Accepted Answer

The np chart control limits are calculated using the formula: np ± 3√(np(1-p)), where n is the sample size and p is the proportion of defects. Given the sample size of 80, the limits are approximately (0.3, 17.1).

The Producers of the Yugo Automobile Periodically Inspect Samples of 80