<div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">On Sat, May 2, 2015 at 12:00 PM, William Flynn Wallace <span dir="ltr"><<a href="mailto:foozler83@gmail.com" target="_blank">foozler83@gmail.com</a>></span> wrote:<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div style="font-family:comic sans ms,sans-serif;font-size:small;color:rgb(0,0,0)"><p class="MsoNormal">While discussing IQ with my undergrads I pointed out that IQ geniuses are in every population. Does that mean that somewhere in deepest Africa is a pygmy with a bone through his nose who has an IQ of 190 and is potentially the greatest mathematician since Fermat? Yes it does. Maybe there isn't, but there could be.</p></div></div></blockquote><div><br></div><div>### Highly unlikely. The IQ of pygmies is estimated at 53. I don't know the standard deviation of IQ among pygmies but if it was the same as among normal populations, an IQ of 190 would be more than 9 sigma above their average. I tried to use a couple of online normal distribution calculators but none were designed to go so far off the mean and all of them gave 0 as answer. As an example, an 8 sigma outlier is found with a probability of 4x10e-13.</div><div><br></div><div>Considering that the number of pygmies is less than a million, we can be expect with a likelihood of > 1-((4x10e-13)/1000000)= 0.9999996 that there are no pygmies with an IQ of 190 or higher.</div><div><br></div><div>Of course, this is a silly calculation - IQ tests are not properly normed for outlier populations, both far below and far above the average, so the true likelihood of extreme genius among pygmies is unknown but certainly very low.</div><div><br></div><div>Rafał</div></div>
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