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t test in R

Discussion in 'CS1' started by Yuvraj, Jul 21, 2022.

  1. Yuvraj

    Yuvraj Made first post

    While doing t test in R for two samples, we have to always use var.equal = T?
     
    Yuvraj, Jul 21, 2022
    #1
  2. John Lee

    John Lee ActEd Tutor Staff Member

    No.
    This assumption is made in the notes - because on paper it's the only way to deal with small samples. In the real world, the assumption of equality of variances is a major issue and shouldn't be used lightly.
    So for the paper B exam, the question will indicate whether you should make that assumption or not - but the default position is we don't.
     
    John Lee, Jul 22, 2022
    #2

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