anonymous
  • anonymous
I'm stuck on a question regarding t procedure. I must determine if the plot (Q-Q normal) is suitable for t procedure. Second question asks which procedure, the pooled-variance t procedure or Welch t procedure, should I use. I have two sets of population, independent of each other. There are no outliers, n=20.
Statistics
chestercat
  • chestercat
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anonymous
  • anonymous
Welch presumes unequal variance while pooled-variance assumes the populations have the same variance
anonymous
  • anonymous
the Q-Q plot is just to ensure our distributions appear 'nice' and approximately normal (few outliers, nice linear trend, etc.) -- it's for justify the statistical methods you use
anonymous
  • anonymous
so that's how you decide whether to use Welch or pooled variance? I thought there were some kind of test or methods to decide. What to do when variance is unknown?

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