2 Sample T-Test (Sample Size)

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Posted by: Darth
Posted on: Tuesday, 3rd November 2009, 11:25 AM.

10% is a proportion. You would have to use a quantitative difference to use a t test...a difference of so many inches. You will still need an estimate of the s.d. to get the sample size. Usually you would do a small sample to get the estimate and then do your full blown experiment. If it turns out that the s.d. was off a little then you will either need a few more to keep the alpha and power where you want or you will have more alpha and beta than you expected which is good.

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 Message Thread:

2 Sample T-Test (Sample Size) by Matthewg on Tuesday, 3rd November 2009

Re: 2 Sample T-Test (Sample Size) by Darth on Tuesday, 3rd November 2009

Re: 2 Sample T-Test (Sample Size) by Matthewg on Tuesday, 3rd November 2009

Re: 2 Sample T-Test (Sample Size) by Darth on Tuesday, 3rd November 2009

Re: 2 Sample T-Test (Sample Size) by Matthewg on Tuesday, 3rd November 2009

Re: 2 Sample T-Test (Sample Size) by Darth on Tuesday, 3rd November 2009

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