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Different types of T-tests

Comparing two sets of independent observations

usually different subjects in each group (number may differ as well)

Condition 1     Condition 2

   S1–S20            S21–43

Paired observations

usually single group studied under separate experimental conditions

data points of one subject are treated as a pair

Condition 1     Condition 2

   S1–S20            S1–S20

Non-directional vs directional alternatives

non-directional (two-tailed)

no expectation that the direction of difference matters

directional (one-tailed)

Only interested if the mean of a given condition is greater than the other

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