While surveys vary widely in how they are conducted and used, there are a number of components that are common across nearly all surveys. Many of these common features have been studied in extensive detail by survey methodologists, psychologists, statisticians, and many other fields of research. The general process of survey research is outlined in the figure below.
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.
I did a lot of research over the weekend to find out what survey panels still pay in cash because, as you may know, many of them are now beginning to offer just gift cards to Amazon or other retailers in exchange for your time spent. I came up with a list of 20 ways you can take online surveys for money (although depending on the company they might also occasionally offer other rewards like Amazon gift cards as well).
MySurvey. This site offers an easy-to-use dashboard, a steady stream of surveys and a decent qualification rate — 28.89%. However, we encountered numerous issues with the site, which made the survey-taking experience generally poor. The disqualification policy was unclear and the 1,000-point minimum cash-out requirement was hard to hit. Check out our MySurvey review to learn more.
Like many survey sites, Toluna rewards you with points, which you can then cash out for vouchers for the usual suspects like Amazon and iTunes, or money through PayPal. A slightly novel element of the site’s payment plan is to offer the chance to take your points out early if you gamble them for prizes. While you have to store up a grand total of 60,000 points before you can claim vouchers for around $12 – something some people find to be a downside of the site – if you are willing to settle for a prize, you can play with just 500 points. You can decide to try your luck with a “giftie”, a kind of scratch card game. By gambling some points, you can see if you have won the gift or lost your points – so it is not one for the faint hearted!
And lastly, let's discuss privacy.  In some ways, Pinecone Research gets it right – they use the information to verify you are not a duplicate or in any way defrauding them out of a valuable opinion.  After that, they only use your personal information for developing metrics and usage statistics – not giving it out to every third party that comes along.  More importantly, they take consumer information privacy seriously.  When they compile their reports for their clients, they scrub all data of any identifying information.

i-Say. This site only provides surveys through Ipsos, the market research firm that owns it. The site offers fewer surveys than aggregators do, but you stay on i-Say for every survey, which makes the overall experience easier. Sometimes it displays surveys you already tried, which is confusing. You can cash out rewards starting at 500 points, which is equivalent to $5. For more information, check out the i-Say review.

Rewards are paid out in cash and PayPal, but the catch of having short surveys is reflected in the pay, which can be miniscule per survey. As you need to earn $50 before you can withdraw anything, that’s a lot of low-paying surveys before you’ve made your money! Some people have complained online that once you get close to the withdrawal amount, the surveys dry up. One way around this is to refer a friend as you’ll receive a bonus when they sign up and you’ll hit your target to withdraw your funds. It’s a bit of a downside, but there are hundreds of very happy consumers who love the site, so it’s worth a shot, especially if you get fed up with the boring or repetitive nature of some of the quizzes elsewhere.
How much are you going to earn using iSay? Their rewards are average compared to the other survey sites out there. Just like with other sites, the amount you get paid is going to differ depending on the length of the survey. You’ll need to accumulate at least 500 points (equals $5) before you can request a payout with PayPal or transfer the money to a gift card. Sign up for iSay HERE. 
“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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