Matched pairs tests have which advantage over before/after tests

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Matched pairs tests require less time to execute than before/after tests.

Matched pairs tests tend to have less error variance than before/after tests.

Matched pairs tests require fewer subjects than before/after tests.

 Matched pairs tests have more degrees of freedom than before/after tests.

Which one of these are the best answers?

May 31st, 2015

Matched pairs tests tend to have less error variance than before/after tests

May 31st, 2015

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May 31st, 2015
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May 31st, 2015
Oct 20th, 2017
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