A p Chart is to be developed for use in quality control. The value of p is calculated to be 0.05.The sample size is 50.What would the upper control limit be?
A) 0.142
B) -0.042
C) 0.408
D) 0.092
E) 0.642

Question

Quizplus · Accepted Answer

The upper control limit (UCL) for a p-chart is calculated as p + 3√(p(1-p)/n), where p is the proportion of defectives, and n is the sample size. In this case, p = 0.05 and n = 50, so the UCL is 0.05 + 3√(0.05(1-0.05)/50) = 0.142.

A P Chart Is to Be Developed for Use in Quality