A delivery company defines a "defect" as a package delivered later than the promised delivery time.Management wants to monitor the proportion of such defect packages per week and plans to sample 120 packages every week.The appropriate control chart is a(n):
A)-chart.
B)R-chart.
C)p-chart.
D)np-chart.

Question

Quizplus · Accepted Answer

As we are dealing with proportions of defect packages per week, the appropriate control chart to use is a p-chart. This chart is used to monitor the proportion of nonconforming items in a sample, which is our case. Therefore, choice A (X -chart) and B (R-chart) are not appropriate for this application. Moreover, choice D (np-chart) is used when the sample size is constant, which is not the case in this problem.

A Delivery Company Defines a "Defect" as a Package Delivered