Tuesday
September 2, 2014

Homework Help: business statistics

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

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