73 LR Two Question 17
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Permalink Submitted by jessme on Jan 23 2017
Hi Dave! I was wondering if you could explain why B is wrong? Part of me knew it was wrong but I couldn't pinpoint exactly why.

Permalink Submitted by majorgeneraldave on Jan 23 2017
I'd say the most important problem with (B) is that we don't know whether the ailment does occur only rarely in cities without soot (maybe it's 60% in cities with a little soot, and 70% in those with a lot, for example).
So we don't know whether this evidence pertains to this argument.
Clearer?