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 Robert Carroll
PowerScore Staff
  • PowerScore Staff
  • Posts: 1783
  • Joined: Dec 06, 2013
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#81144
lina,

I think the chief problem with answer choice (C), and your explanation for it, is that we're still faced with a situation where a smaller percentage of those who migrate are affected. As you said, it's possible that 15% of those who migrate represents a larger number than 95% of those who don't migrate, if a lot more migrate than don't. The issue is, 85% of those who migrate aren't infected! So if 15% of the migrating population is larger than 95% of the non-migrating population, 85% of the migrating population is HUGE! So we're still faced with a situation where the odds are very good that a non-migrating butterfly is infected, and a migrating butterfly is not infected. Changing numbers can't change those percents, so the possible difference in population sizes is just not relevant.

Robert Carroll

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