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Compare and contrast the purposes of each type of t-test (single, independent,

and repeated). Under what conditions/circumstances should you use each type? Include in your discussion the types of samples, comparisons, variance, pooled variance, matched-pair, individual differences, # of samples involved, etc. This is not a simple question and requires a comprehensive response to cover all aspects. As it states above, the responses should be mostly in your own words, but you can cite sources to support your statements. 

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