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) $ \bar{x} $-chart.
B)R-chart.
C)p-chart.
D)np-chart.

Question

Quizplus · Accepted Answer

Since the attribute being monitored here is the proportion of defective packages (late delivery), the appropriate control chart is a p-chart. This is because a p-chart is used to monitor the proportion of nonconforming items or defects in a sample over time. The other options are not appropriate for this scenario- a $ \bar{x} $-chart is used to monitor continuous data, an R-chart is used to monitor the variation in a process, and an np-chart is used when a fixed number of items are sampled each time.

A Delivery Company Defines a "Defect" as a Package Delivered xˉ \bar{x} xˉ

A Delivery Company Defines a "Defect" as a Package Delivered $\bar{x}$