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2. Survey sampling - Wikipedia

   en.wikipedia.org/wiki/Survey_sampling

   A sample refers to a group or section of a population from which information is to be obtained. Survey samples can be broadly divided into two types: probability samples and super samples. Probability-based samples implement a sampling plan with specified probabilities (perhaps adapted probabilities specified by an adaptive procedure).

3. List of free and open-source software packages - Wikipedia

   en.wikipedia.org/wiki/List_of_free_and_open...

   Moodle – Free and open-source learning management system. OLAT – Web-based Learning Content Management System. Omeka – Content management system for online digital collections. openSIS – Web-based Student Information and School Management system. Sakai Project – Web-based learning management system.

4. Estimation theory - Wikipedia

   en.wikipedia.org/wiki/Estimation_theory

   Estimation theory. Estimation theory is a branch of statistics that deals with estimating the values of parameters based on measured empirical data that has a random component. The parameters describe an underlying physical setting in such a way that their value affects the distribution of the measured data. An estimator attempts to approximate ...

5. Access a free AOL plan - AOL Help

   help.aol.com/articles/free-aol-plan-faqs

   Access a free AOL plan. If you're already connected to the internet and not using AOL dial-up, you have free access to AOL software, email and several other services. This includes your AOL username and email account accessible at mail.aol.com, AOL security services protecting against spam and viruses within your AOL mail account, your AOL ...

6. How do I activate my AARP membership? - AOL Help

   help.aol.com/articles/how-do-i-activate-my-aarp...

   Activate your AARP membership by doing one of the following: 1. Visit the AOL AARP webpage and click Get Started. Follow the prompts to complete your AARP membership registration. Note: Whether you are an existing AARP member or not, you will need to register.

7. Professional association - Wikipedia

   en.wikipedia.org/wiki/Professional_association

   Professional association. A professional association (also called a professional body, professional organization, or professional society) is a group that usually seeks to further a particular profession, the interests of individuals and organisations engaged in that profession, and the public interest. In the United States, such an association ...

8. Subscription business model - Wikipedia

   en.wikipedia.org/wiki/Subscription_business_model

   Subscription business model. The subscription business model is a business model in which a customer must pay a recurring price at regular intervals for access to a product or service. The model was pioneered by publishers of books and periodicals in the 17th century, [ 1] and is now used by many businesses, websites [ 2] and even ...

9. Learn more about AOL's Free Email with AOL Mail | AOL Products

   www.aol.com/products/utilities/aol-mail

   Keep your inbox clutter-free with automated tools. See all emails based on topic (e.g. photos), with contextual bonus features with the new Views functionality. Or, use advanced filters to sort ...