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Paired t-test

  1. Oct 8, 2003 #1
    What is the equation for a paired t-test?
  2. jcsd
  3. Oct 9, 2003 #2


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    It's the same as a normal t-test. You just have to keep in mind that you're testing against the null hypothesis H0: μD = 0, where μD is the population mean of differences between pairs of observations. So it's

    t0 = d(bar) / (sd / √n)

    where d(bar) and sd are the sample mean and sample standard deviation for the differences between each pair.

    edit: And just to be clear, n is the number of pairs of observations.

    Basically, you treat this like a regular t-test problem, except your random variable is the difference between each pair of observations.
    Last edited: Oct 9, 2003
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