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.
(Learn how and when to remove these template messages) AOL Explorer, previously known as AOL Browser, is a discontinued graphical web browser based on the Microsoft Trident layout engine and was released by AOL. In July 2005, AOL launched AOL Explorer as a free download and as an optional download with AIM version 5.9. AOL Explorer supports tabbed browsing.