Global News POLL: Would you support the implementation of vaccine passports?
(twitter.com)
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You'd be surprised how accurate that few can be. (It's why you see the margin of error can be a few percentage points, 19 times out of 20.) Heck, the Nielsen ratings in the States are essentially surveys of about 8000 households for the entire country of 300+ million people.
Oh, undoubtedly. Online polls are biased because they're not randomly selected. It's why most polls are conducted over the phone through unsolicited calls.
That's not a random sample either because one's agreeability to unsolicited phone polls probably has other correlations. And people lie.