A company wishes to monitor the variation in the length of time it takes to process and send a bill to a customer.Seven bills will be randomly selected each day for a 60-day period and the length of time it takes to process and send the bill to a customer will be recorded for each bill.The appropriate control chart is a(n):
A) $ \bar{x} $ -chart.
B)R-chart.
C)p-chart.
D)u-chart.

Question

Quizplus · Accepted Answer

The R-chart (range chart) is the appropriate control chart for monitoring the variation in the length of time it takes to process and send a bill to a customer. As only seven bills are being sampled each day, an $ \bar{x} $-chart (mean chart) or a p-chart (proportion chart) is not appropriate. A u-chart (count chart) would be more appropriate for monitoring the number of bills processed or sent per day.

A Company Wishes to Monitor the Variation in the Length xˉ \bar{x} xˉ

A Company Wishes to Monitor the Variation in the Length $\bar{x}$