Posted by **Josephine** on Monday, August 24, 2009 at 1:48pm.

Please can you give me the step to do this exercise? Thank you

Samples of 12-volt batteries are taken at 30-minute intervals during a production run. Each sample consists of 3 batteries, and a technician records how long each battery will produce 400 amperes during a standard test. Given the following data, also listed in file XR20042, construct- 3-sigma mean and range control charts and evaluate whether the process is in control.

Minutes Sample Battery1 Battery2 Battery3

13.3 1 13.3 9.4 12.1

9.4 2 12.2 13.4 8.5

12.1 3 11.2 8.2 9.2

12.2 4 7.8 9.7 10.0

13.4 5 10.1 11.4 13.8

8.5 6 9.9 11.7 8.5

11.2

8.2

9.2

7.8

9.7

10.0

10.1

11.4

13.8

9.9

11.7

8.5

- business statistics -
**drwls**, Monday, August 24, 2009 at 1:50pm
The "following data" does not show up with your question.

- business statistics -
**Josephine**, Monday, August 24, 2009 at 2:18pm
Minutes Sample Battery Battery Battery

$ e 1 2 3

13.3 1 13.3 9.4 12.1

9.4 2 12.2 13.4 8.5 12.1 3 11.2 8.2 9.2

12.2 4 7.8 9.7 10.0

13.4 5 10.1 11.4 13.8

8.5 6 9.9 11.7 8.5

11.2

8.2

Thank you drwls (this is the second part of the exercise)

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