I reside in Jamaica. I am at a disadvantage in securing paid surveys because of my location as the so-called first world countries receive all the choice survey sites leaving the crumbs that fall from the Master’s table. The survey field needs to be leveled. Because of the advent of IT capability, the world is just one community. Everyone is aware of what goes on everywhere.
Wow, This is the first article I’ve ever read that 1. didn’t offer up filling out surveys as a serious way to earn extra cash, and 2. said everything I’ve ever thought about surveys as a side hustle. I don’t know why people keep suggesting this, when as you point out, there are much better side hustles to score serious cash more efficiently. WELL DONE! ;)
I’ve had bad experiences with iPoll. I’ll answer the “screening” questions and am told I qualify to take the survey, then once the survey is around 90% complete, I’m told the survey is “closed”. My guess is this is how they’re getting their data without having to pay participants. I’ve also gotten “invalid website” in the middle of some of their surveys as well, of course, after answering 15 minutes of questions.

After joining a survey site, you provide some personal and demographic information, which legitimate survey sites will keep private. That information will be used in choosing participants to take surveys on certain goods and services. If you get selected to take part in a survey, you will be notified through mail to take a short survey to see if your profile suits that survey. When you are deemed qualified, you will be requested to take a longer survey.
You’ll be able to cash out your points either through PayPal or with a gift card. Survey Junkie claims you can get your cash out instantly, but this isn’t necessarily true. In most cases, if you request a payout through PayPal and it can take up to 24 hours, but in most cases it is immediate. Compared to other sites out there, this is a huge advantage. Some companies and sites can make you wait several days or even weeks. Sign up for Survey Junkie HERE. 
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).
The rewards for the MySurvey surveys are on par (or better than some) with most other sites. They offer $0.50 to $1.25 for every survey that you complete, with the shorter surveys only taking around 5 minutes to finish. When you want to cash out, you’ll have to accumulate $10, which is less than some of the other sites, and you’ll be able to get your money through a check, PayPal, Amazon gift card, or the more than 60 other gift card options. Sign up for a free mysurvey account HERE.
While it might be hard to believe at first, American Consumer Opinion will pay you real, actual money to share your opinions and complete online surveys. Once you join their online opinion panel, you’ll be asked to offer opinions on new products you have tried, test out new advertising campaigns, and tell companies what you think of their marketing techniques and slogans.
There have been some reports of technical glitches on the site preventing users from receiving their earnings, but customers services are contactable and said to clear up most issues for workers. Valued Opinions has a unique “badge” program, allowing its most active members to work up five levels of achievement from bronze through silver, gold and platinum to the top tier of diamond, by carrying out extra mini tasks.
Privacy: 5.0/5.0 – Swagbucks' privacy policy for its own site is excellent; they always tell you exactly how your info will be used. We have not personally received any spam through Swagbucks. As with most other survey sites, Swagbucks does contain links to other sites which may have different privacy policies, so you should be careful when visiting other sites.  You can read Swagbucks' privacy policy yourself here.

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.
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