L36 Test results: Stock intake/AF vs gutted airbox w/K&N - Page 4 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat
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Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 02-12-2007, 08:50 PM   #31
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Originally Posted by agrazela
Originally Posted by mkaake
Just as a quick aside, it looks like you used Excel to figure out your standard deviation... but you need to use stdevp(), not stdev(). stdev() is only an approximation to standard deviation, whereas stdevp() is the calculated value. I think the only reason they provide both functions is for calculation time on very large data sets... but they should have made the more intuitive stdev() the real calculation, and not an approximation.
IMO, I did not have enough data points to use the stdevp() function. i would only use that function if I had at least 12 data points.
Ahhh.. that explains it. I just type it by default, so the first thing I noticed on your first post was a difference in standard deviation numbers
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