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What formula is this?

  1. Jan 24, 2007 #1
    great forum, been looking at some past papers and saw this formula in a stats paper - don't know what it is. i want to know as it is used to calculate a question. please help...
    its put up as an attachment...


    t = x1 - x2 / s (√ 1/n1 + 1/n2)

    the x's are x bar

    thanks in advance...

    Attached Files:

    Last edited: Jan 24, 2007
  2. jcsd
  3. Jan 25, 2007 #2
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