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.
Supplemental privacy policies for AOL companies and the services they provide are described in the AOL privacy policy. In the event of a conflict between the Verizon privacy policy and the AOL privacy policy, the AOL policy will control when you are on an AOL site or using an AOL product or service. Certain services we offer (such as go90, MapQuest and Verizon apps) have additional privacy practices that are presented separately.