Posted by **Josephine** on Tuesday, August 25, 2009 at 2:14pm.

Samples of 12-volt batteries are taken at 30-minute intervals during a production run. Each sample consists of three 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, range control charts, and evaluate whether the process is in control.

Sample Battery1 Battery2 Battery3

1 13.3 9.4 12.1

2 12.2 13.4 8.5

3 11.2 8.2 9.2

4 7.8 9.7 10.0

5 10.1 11.4 13.8

6 9.9 11.7 8.5

Minutes

13.3

9.4

12.1

12.2

13.4

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

Please I need help, can you give the step to do this exercises.

Thank you very much.

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