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    Two population means

  • Populations are independent and population standard deviations are unknown.
  • Populations are independent and population standard deviations are known (not likely).

    Matched or paired samples

  • Two samples are drawn from the same set of objects.
  • Samples are dependent.

    Two population proportions

  • Populations are independent.

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Source:  OpenStax, Quantitative information analysis iii. OpenStax CNX. Dec 25, 2009 Download for free at http://cnx.org/content/col11155/1.1
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