business statistics
posted by Josephine .
Samples of 12volt batteries are taken at 30minute 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 3sigma 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.

business statistics 
economyst
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