QuickE Lube has been monitoring its customer service times over the past 5 days.

Question

QuickE Lube has been monitoring its customer service times over the past 5 days. Each day they took a sample of 14 customers and recorded the actual service times for those customers. The table below shows the sample mean and sample range for each of the 5 past samples.

1

2

3

4

5

20.2

18.6

19.4

22.0

21.8

4.1

0.8

3.2

2.9

1.0

What are the three-sigma lower and upper control limits the company should use to construct an R-chart for this service time data? Refer to the table in the intructions at the top of the page.

LCL = 0.79, UCL = 5.06

LCL = 0.00, UCL = 4.01

LCL = 0.79, UCL = 4.01

LCL = 0.00, UCL = 5.06

1

2

3

4

5

20.2

18.6

19.4

22.0

21.8

4.1

0.8

3.2

2.9

1.0

Explanation / Answer

option B is right answer

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