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T test

  1. Apr 2, 2008 #1
    1. The problem statement, all variables and given/known data

    If i have data and want to compare the two means, when is it appropriate to use the t test?

    3. The attempt at a solution

    i know its because the distribution is normal but there are also other reasons.
    Thank you.
     
  2. jcsd
  3. Apr 2, 2008 #2
    the t-test is used when the sample size is "small" less than 30 and the underlying distribution is normal.
     
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