Based on the LA port container cycle times shown above, which of the following statements fits best?单项选择题

A

The upper control limit of the Xbar chart is 8.62

B

The upper control limit of the Range chart is 3.28

C

The lower control limit of the Xbar chart is 0

D

The lower control limit of the Range chart is 1.91

E

None of the responses

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Based on the Amazon Order Fulfillment data above, which of the following statements fits best?

A canning company defines a “nonconformance” as an orange juice can whose diameter is beyond the upper specification limit. A manager at the canning company wants to monitor the number of such orange juice cans produced per day. Each day, an employee will randomly select 120 cans over a period of four weeks. The employee then determines and plots the number of nonconformance cans in each sample. The appropriate control chart is a(n)

Which type of chart monitors the fraction of nonconforming units?

A better alternative to using the R-chart to monitor variation is the

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