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anonymous
 one year ago
I'm stuck on a question regarding t procedure. I must determine if the plot (QQ normal) is suitable for t procedure. Second question asks which procedure, the pooledvariance 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.
anonymous
 one year ago
I'm stuck on a question regarding t procedure. I must determine if the plot (QQ normal) is suitable for t procedure. Second question asks which procedure, the pooledvariance 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.

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Welch presumes unequal variance while pooledvariance assumes the populations have the same variance

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0the QQ 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
 one year ago
Best ResponseYou've already chosen the best response.0so 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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