* This is a footnote to the above post. (and the third in a series on basic math concepts) The ProPublica people don’t explain confidence intervals at all in this piece, but in their original they say, “a 95 percent confidence interval indicates that black teenagers are at between 10 and 40 times greater risk…
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This is the second of two postson basic math. Use rates when you want compare something in groups of different sizes. Say New York City has 400 homicides a year. Say Baltimore City has 300 homicides. Is New York more dangerous than Baltimore because New York has more homicides. No. Because New York is much…
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As promised, here is how to determine basic percentages. Too many of my college students don’t understand basic percentages. Clearly GTF has the same problem. So here is how it works — in words — with no math symbols. I’m totally serious. It’s never too late to learn. And not knowing how to relate “doubled”…
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