TwinTurbo.NET: Nissan 300ZX forum - You seem to understand probability analysis well
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Subject You seem to understand probability analysis well
     
Posted by Janders on October 26, 2003 at 12:50 PM
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In Reply To What is the error bar? posted by kuah@splparts.com on October 26, 2003 at 12:01 PM
     
Message and I don't have the t-critical values anywhere in my house...
can you calculate the Confidence interval of 90% and 99% with an N of 2 and xbar equal to four hundred to see if it captures 415(xbar 2(aka HKS gain). I imagine with a small N the standard of error will make this fairly hard, with a large gap between the lower and upper limits of the confidence interval, but I'd still like to see the results.

I'd do it, but I don't have a tcritical chart
15/Sx
CI of 99%=400+-tcrit(Sxbar)
Sxbar=S^/sqrtof 2
S^=sqrt((E(summation)x^2 - ((Ex)^2)/2))/1))

Oops, can't calculateSxbar with an N of 2, you get 0 which obviously screws up a confidence interval. **If N was 3(since two can't be used-obviously there are not really three dynos- so this is just for arguments sake)
S^=346
So CI%+-(tcritical value of 10% or 1% with N of 3) * 346

I have a feeloing these numbers of variation are going to be huge and not very useful.

     
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