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.
A popular and free survey site, Toluna boats more than nine million users across the globe and is well known in the industry, having been running for 17 years. Offering questionnaires for you to fill in to provide leading companies with your opinions, Toluna also runs a range of internal games and schemes, as well as offering product testing to some lucky users who can bag free products.

MintVine is a cool looking paid survey site that makes it easy to complete a survey, without having to spend too long learning how to do it. One of the things I liked most about MintVine is that they offer a huge amount of ways to get paid: there’s the old favorite PayPal of course, but you can also choose Starbucks cards, Amazon and other gift cards, and even restaurant cards. Your surveys can pay for your next meal, and it’s easy to rack up points here. Some users have reported delays in receiving payments however, but this isn’t a scam and MintVine are working hard to speed up their process and iron our any glitches. If they do, they could be heading into the Survey Cool top ten in 2018.
This is where it can all go downhill quickly.  In the pressure to make as many pennies out of a nickel, a lot of research corporations will not just sell your answers but the data associated with it.  Details that you provide when taking paid surveys such as your name, address, age range can all be attached together quickly to fulfill a lot of larger companies' requests for information (RFI).

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.
**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.
“I participated in an in-home product trial study. A coffee machine company sent me one of the coffee makers along with about 200 coffee pods. I received $7 for completing 3 short surveys. Plus, after the study, the company said I could keep the coffee maker. So, I got like 4 mos of coffee for everyone in my household, a free coffee maker and $7!” - David W.
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