Which of the following charts is used to monitor the average number of nonconformances per unit when sample sizes vary?
A)-chart
B)c-chart
C)p-chart
D)u-chart

Question

Quizplus · Accepted Answer

The u-chart is used to monitor the average number of nonconformances per unit when sample sizes vary. The u-chart is appropriate when the sample size is not constant, and nonconformances are rare events. The u-chart is calculated by dividing the total number of nonconformities by the total number of opportunities for nonconformities over a series of samples. Therefore, D is the correct option.

Which of the Following Charts Is Used to Monitor the Average