Chapter 13, Level 1 Self-Quiz: E

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Read the statistical reasoning in the following passage, and answer the question that follows.

It's possible to see procrastination as the quintessential modern problem. It's also a surprisingly costly one. Each year, Americans waste hundreds of millions of dollars because they don't file their taxes on time. The Harvard economist David Laibson has shown that American workers have forgone huge amounts of money in matching 401(k) contributions because they never got around to signing up for a retirement plan. Seventy percent of patients suffering from glaucoma risk blindness because they don't use their eyedrops regularly. Procrastination also inflicts major costs on businesses and governments. The recent crisis of the euro was exacerbated by the German government's dithering, and the decline of the American auto industry, exemplified by the bankruptcy of General Motors, was due in part to executivesÂ’ penchant for delaying tough decisions.

James Surowieki, "What Does Procrastination Tell Us About Ourselves?" 

How many of Surowieki's claims lack evidence?

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