How long should a test be run? - Fuelly Forums

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Old 08-21-2007, 10:12 AM   #1
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Thumbs up How long should a test be run?

Just wondering if there is a rule of thumb as to how long a test should be run before it can be declared a "winner" or a "bomb?" I'm trying to get awy from my "one tank wonder" testing...
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Old 08-21-2007, 11:05 AM   #2
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http://www.gassavers.org/showthread.php?t=4016
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Old 08-21-2007, 06:30 PM   #3
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Ya, see that thread. It depends on how stable your results before and after are, and what size change you are trying to prove.
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Old 08-22-2007, 01:08 PM   #4
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The longer the test the more accurate your results will be.
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Old 08-22-2007, 06:31 PM   #5
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You can test for statistically significant differences between two means using Microsoft Excel. It's in the Data Analysis toolpak add-in thingy I believe. Just install it and use Help. I'm sure similar directions were given in the thread referenced.
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Old 08-23-2007, 05:39 PM   #6
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Ah, cool. Thanks for posting that, JD.
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