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- Populations are independent and population standard deviations are unknown.
- Populations are independent and population standard deviations are known (not likely).
Two population means
- Two samples are drawn from the same set of objects.
- Samples are dependent.
Matched or paired samples
- Populations are independent.
Two population proportions
Read also:
OpenStax, Elementary statistics. OpenStax CNX. Dec 30, 2013 Download for free at http://cnx.org/content/col10966/1.4
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