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.
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.
Its free to use, no subscription required, you can create as many surveys and collect as many responses as you want, There are no restrictions on making surveys. If you want to view all responses it's free, no upgrades to paid plans are required. However, if you are just starting out or need only a small poll or survey, eSurv is exactly what you’re looking for to make your first survey.

By filling out your user profile thoroughly, you’ll be able to make sure you get invites to surveys which are actually suitable for you. There are basic qualification questions at the start of each questionnaire too, to ensure you are suited to filling it out before you get going. And you can make the most of the huge Toluna community yourself too – if you want, you can create your own polls on the site to ask people about anything and everything! It’s a nice addition to be able to get involved and have in-depth conversations with fellow users.

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.
Paid survey site companies invest billions of dollars into marketing research online.  They always want to find out more intricate details of a consumer's relationship with their product.  Whether it's a new television show or just an existing product line, companies like Disney, Samsung, and Sony go to great lengths to find out their ideal audiences.
Taking online surveys is a compelling offer. You can earn money—either in cash or frequently gift cards or rewards points—and all you have to do is have an opinion. You can earn that money from the comfort of your own home in sweatpants with a glass of wine, or knock out a few surveys during slow moments at the office, racking up money when you’d usually just be trolling Facebook. Who wouldn’t jump at the opportunity?
The only way to make this work would to be a serious survey junkie who can dedicate hours to the work, which defeats the purpose of a side hustle entirely. What’s worse is the idea that you can’t adequately plan your time—a survey might take twice as long as it says or five times as long. That kind of unpredictability means this isn’t a side hustle you can rely on.
Some pay with points that are redeemable for cash or goods and typically you must rack up a bunch to redeem them for anything of significance. Others may give you a gift card, discount, or another token of appreciation for participating. Many others pay nothing or only offer sweepstakes entries for completing screening surveys to determine your eligibility for other, paid surveys. A few don't pay much of anything, unless you recruit others, as in a pyramid scheme.

Oh I forgot to add that at least mypoints uses some of the listed above and others for surveys. vindale.com ( I have tried and was ok. I got paid but lots of work for not always getting into/doing survey although there are higher amounts you have to buy and so 35 might be like 10.00 after you buy things so be careful) and panda research is similar.
Renowned for its short and sweet surveys, OnePoll is a great site for dipping in and out of, without having to dedicate loads of time to. As one of the earliest survey sites to be set up, OnePoll certainly has longevity. Founded in the UK, it is open to US users and those further afield and runs polls for the press and leading brands. This means the content is more engaging than it can be elsewhere and you can find yourself answering questions about celebrities or gossip. Many users praise their surveys for being quick, and even better – fun! Topics are not as dry as they can be on other websites, and by keeping the surveys brief, OnePoll is less likely to leave you bored or frustrated.

How It Works: Swagbucks is a favorite of mine,  as well as a favorite of many readers here. Not only do they offer a wide range of surveys that pay cash, but you can also earn points for the everyday things you do online like searching, shopping, and watching videos. In total, Swagbucks has paid out over $187 million in rewards. Even if you’re not interested in doing surveys, it’s still easy on the platform to earn decent money with what you’re already doing online today.
Although it might seemed biased to put forth this assertion, the proof is truly in the pudding. Whereas virtually every other way you can earn money online will require some level of skill, more time or the like, paid online surveys consistently offer consumers an opportunity for completely autonomous and consistent participation. This means that there are no contracts, fillers or complexities to navigate, just simple, unadulterated activities that put extra cash in your pockets. 
Some pay with points that are redeemable for cash or goods and typically you must rack up a bunch to redeem them for anything of significance. Others may give you a gift card, discount, or another token of appreciation for participating. Many others pay nothing or only offer sweepstakes entries for completing screening surveys to determine your eligibility for other, paid surveys. A few don't pay much of anything, unless you recruit others, as in a pyramid scheme.

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!
Survey Junkie makes it quick and easy to jump into the survey game. According to their websites, they say they are the most popular spot online to earn cash and rewards for sharing your thoughts, while that might not be technically true, they are one of the largest survey sites out there. They were launched all the way back in 2005 (which is pretty old for a survey site) and they have over 4,000,000 members. 

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One of the most popular sites, and rightfully so, Swagbucks offers traditional surveys as well as a range of additional ways to make cash. Filling out surveys for money will reward you with points called Swagbucks which can be cashed out through PayPal, or redeemed as gift cards for shops including Amazon.com. As a sweetener, they’ll even give you $5 just for signing up.
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