Select a representative sample: Selecting a representative sample from your sampling frame is also important for collecting valid and reliable data about the population of interest. For example, if you are sampling from a large database of customer email addresses and only wanted one response per household, you might want to cross-check each email address against mailing addresses and remove duplicates to avoid some households having a greater probability of selection. Then you would likely draw a random sample from the remaining list of email addresses.
First, thank you for providing this extensive list. I wanted to offer a quick follow up. After reading your post I decided to give Survey Junkie a try and I’ve already closed the account. Yes, I can tell it’s well organized and it is definitely a user-friendly platform. The problems I experienced were first that not one of the surveys they emailed me about were available. I did, however, complete several surveys from the site itself and I found them to be lengthy – in itself, not a problem, but 3 out of 5 told me I didn’t qualify after I’d already invested 10 – 12 minutes filling out the forms. They got more than enough information from me to be useful which is an old and highly unethical trick in market research – which happens to be my background. All in all, it was a LOT of wasted time.
Hop onto the iPoll survey site, and you’ll see a cheerful cartoon of a man walking his dog while thinking about products. Their boast is that thanks to its web, iPhone and Android platforms, you can complete surveys at home, in the office, at the beach, or on a walk. I put that to the test. This is one of the easiest to use survey sites on a mobile phone, and that’s because the surveys offered are sharp and quick, and the site itself is easy to navigate and use, whatever platform you’re using it on. This is a good choice for people whose online time is mainly spent on their cell phone.
When offered a grand promise for a seemingly small price, many more are likely to fall for it. Being human, the idea of paying very little for great return is incredibly enticing. This is the leading idea behind offers like “Earn $200 every day! Just $10 for access to our exclusive list of high paying surveys.”  When entering the arena of paid online surveys, it's important to be wary of any offer like this that seems too good to be true.
Privacy: 5.0/5.0 – As a sister company to Swagbucks, MyPoints is governed by the same privacy policy, which is detailed and very reasonable. In our experience, MyPoints has never sent us spam. As is typical, MyPoints does link to other sites that have different privacy policies, but to be fair, our 5 star rating is based on the MyPoints privacy policy.  You can view the MyPoints privacy policy for yourself here.
**NO PURCHASE NECESSARY. Open to legal residents of the 50 United States (D.C.) who are eligible to participate on a Survey Sampling International Panel and meet the minimum age requirement for the respective Panel. Quarterly drawings; enter by December 31, 2016 to be included in next drawing. To enter and for Official Rules, including odds, mail-in method of entry, and prize descriptions, visit here. Void where prohibited.
Something very important to note before signing up at any site claiming to pay you cash to take surveys is that all legitimate sites offering online surveys that pay do not charge registration fees – they are free to join. Some sites may even offer you bonus as you sign in, to show you they are happy you have become a part of their team and helping them increase their revenue.

The concept of data mining and profiting off that data mining isn't anything new.  And while some companies engage in some rather disreputable practices to do this, Global Test Market seems to be doing just fine with the whole “consent to disclose” thing.  More importantly, in some cases this may help you as some companies will offer to do more specialized product testing once they've identified you as their target demographic.

Companies, brands, and organizations from around the globe are constantly seeking the opinions of people just like you to help shape the products they develop and how they market them. They count on paid online surveys to provide them with reliable information. If you spend time online and enjoy giving your opinion, paid surveys are a great way to earn a little extra cash while helping these companies.

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