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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...

    or...

    t = x1 - x2 / s (√ 1/n1 + 1/n2)

    the x's are x bar

    thanks in advance...
     

    Attached Files:

    • form.bmp
      form.bmp
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    Last edited: Jan 24, 2007
  2. jcsd
  3. Jan 25, 2007 #2
    Looked familiar, so I glanced around; it looks like the two-mean hypothesis test, where s_1 = s_2
    (i.e. the formula I found for the two-mean hypothesis test was the same as yours, except the s was under the square root as s_1 and s_2 squared.)
    Here:
    http://www.duxbury.com/statistics_d/templates/student_resources/0534377556_woodbury/artfinal/Formulas/Formula%205.jpg [Broken]
     
    Last edited by a moderator: May 2, 2017
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