How much should you trust IQ etc. information from The Guardian? Experts answer: not so much http://emilkirkegaard.dk/en/?p=7113 pic.twitter.com/v1TpK0yAO7
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if you dont have a differential response rate, sure it might not matter. Where's the evidence that their sample was not biased ?(beyond expecting to take at face value their claim that 'lefties and righties' both refused equally?
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The assumption should be it might be biased when you have a 10-18% response rate, when the survey youre replicating had 65%, and when people responded saying the questions werent good/doubt the experts you were canvassing, no?
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