Paired t-tests are a form of blocking, and have greater power than unpaired tests when the paired units are similar with respect to noise factors that are independent of membership in the two groups being compared.
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As of 2014, the best way to contact AOL by phone is to call 800-827-6364 between 8 a.m. and 10 p.m. Eastern time. This number provides AOL members assistance with their accounts, connections and other technical issues, according to AOL Help. It is also the number for password-related issues. Continue Reading.