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. 
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.

Most reviewed paid survey sites effectively promise not to share personally identifiable information or not to share it without your consent. It's an industry standard by which legitimate marketing research firms are bound. But many membership sites reviewed don't make either promise or do so only in a limited or wishy-washy way. Unauthorized go-betweens don't have to honor marketing research privacy standards.
Free to join, the site runs a range of special offers, including awarding prizes at random, giving you daily targets to hit for which you receive bonus points, and posting deals on their social media feeds. They have a great new app and a strong referral scheme. However, like everything, it’s not perfect – it can start to suck up a lot of your time. Swagbucks runs on the premise of incentivising day to day internet use to make both you and them money, so it is worth being aware of this so it doesn’t end up seeping into too much of your life!
They include sites that seem to be their competitors because they earn referral fees when you buy memberships. A couple mentioned in scam forums even try to dupe you into buying the same list at other membership sites they own under different names. Naturally, these sites also have an incentive to exaggerate how much you'll earn from online paid surveys.
Unlike many sites, Valued Opinions doesn’t offer you the chance to take cash rewards, at the moment limiting users to retail vouchers and gift cards. Electronic vouchers are usually with you within 24 hours but gift cards can take four to six weeks to arrive in the post. Once $10 has been earned, you can claim Amazon vouchers, Macy’s gift cards and Visa promo codes, among many other reward options dependant on your location. Surveys are said to be varied, but the gift card options less so, so check they are for stores you’ll want to shop in before you tot up lots of points.
Design and pre-test questionnaires: Designing the questionnaire carefully and then pre-testing it before fielding it to your entire sample is crucial to getting data that are valid and reliable. For example, careful questionnaire design and pre-testing can help reduce the chance that respondents may interpret the meaning of questions differently. Future posts in this series will tackle these important steps in much greater detail.
Harris Poll has made a strong presence in the market research industry. They are a member of the National Council of Public Polls (NCPP), the Council of American Survey Research Organizations (CASRO), the Council for Marketing and Opinion Research (CMOR), and the European Society for Opinion & Marketing Research (ESOMAR). The firm abides by the  standards of these organizations, thus proving their reputability.
The other type of paid surveys CashCrate features are targeted surveys, which are available only to you and people who meet your demographic profile. It's very important that you fill out your profile on CashCrate right when you sign-up. Not only will you earn $.50 instantly, you'll also be eligible to receive these special surveys. So why are they so great? First, they'll often pay more than Daily Surveys. That means when you see one available, you should jump on it right away.

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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