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.
In addition to filling out online surveys for money, you can get rewarded for other actions, too. Some of the best paid survey sites are ones that offer lots of ways to make extra money other than earning money for surveys you take! The most popular websites maintain their following not only by offering various types of incentives but also by providing plenty of different and engaging ways for members to earn money. The purpose of these offers is to turn you into a loyal and active member of their community.
One of the oldest and longest running survey sites, Vindale Research is a legitimate option for making some money from filling out surveys. Based in New York, the company offers both traditional surveys and evaluations, by testing products or online services. It’s free to sign up, and surveys pay between $1 and $5 each and product testing starts at $5 and moves up from there. The site claims significantly higher rates of pay, but as this involves slightly inflated pricing, for example discounting fees you may have to pay out to join subscription sites before receiving your end payout, they won’t be included here.

Rewards vary based on the survey type and the company conducting the survey. You may get paid online through PayPal or a Visa gift card, or get free products so that you can try them and provide feedback. To get the best out of online surveys, it is recommended you join several websites (10 to 20) so as to give you sufficient invitations daily at the best time frame. Regularly check your email and be honest while giving your opinion. Don’t give up if you don’t get selected for a survey after the first screening process, as it will take a while before you get selected based on your demographic.
Unlike some of the other sites, with Inbox Dollar, you essentially sign up to take advantage of whatever Inbox Dollar makes from their advertisers.  They will send you emails which they get paid per receipt of you reading them or clicking a link.  In turn, they give you a cut.  Not to ruin your day but it's a rather small cut.  The links that end up paying out the most usually have some stipulations attached – such as signing up for a service.  This can end up being a lot more hassle than its worth and we recommend you pay VERY close attention to the stipulations.
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 – 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.
I have a very serious question I have been a member of InboxDollars for over 2 years they send me emails that say here’s a survey for you and they waste 10 minutes of my time going through it to tell me that I don’t qualify I wrote them and said I gave you all my demographic information please do not send me this and waste my time but they consistently do that.

If you're looking to make money by completing surveys online – this site will not be very helpful for you.  Like the previous sites, they will take, retain, and sell your information to anyone that waves a dollar in their faces.  UNLIKE previous sites reviewed, they hide their consent for that information.  It's buried.  So not only do you make silly reward points that don't translate to cash but every third party service and product solicitor has your personal information.
Surveys can be super quick and take just a few minutes to fill out, or require around 15 minutes of your time. Five minute surveys pay $0.50 and surveys range from $0.40 up to the higher – and rarer – ones at $10.Paying out by the usual methods, Crowdology does PayPal and also vouchers. Most importantly, the minimum reward threshold is low so when you’ve earned $8, you can cash it out, unlike other sites which make you wait until you have earned much more money. The site offers prize draws from time to time for things like cinema tickets and surveys can be expected weekly.
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.

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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