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.
The service, by the way, is called AOL My eAddress. AOL says it supports .com or .net domains, up to 100 e-mail identities per domain, 2 GB of storage, spam filtering, and open mail clients such as Outlook and Thunderbird through the IMAP protocol.
AOL Member Services. 866-401-3158. Before dialing AOL Member Services. We've tried for years to eliminate that 21 minute wait for you. But the fact is that it can still take many phone calls to AOL to resolve your issue. Now you can hire GetHuman to do all the work on the phone for you.