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.

1. As you can see, cutting and pasting does not work so well on the jiskha site. Sorry.

posted by economyst

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