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)-chart.
B)R-chart.
C)p-chart.
D)u-chart.

Question

Quizplus · Accepted Answer

An R-chart (range chart) is the appropriate control chart to monitor the variation in the length of time it takes to process and send a bill to a customer because it measures the range of time taken to process each bill. Since the company is randomly selecting seven bills each day, an average of ranges can be used to monitor the process over time. A u-chart (for count data) or a p-chart (for proportion or percentage data) would not be appropriate for this situation. A Shewhart control chart (A-chart or X-bar chart) would be appropriate, but since the question specifically requests identifying the appropriate type of control chart, the best answer is the R-chart.

A Company Wishes to Monitor the Variation in the Length