- PowerScore Staff
- Posts: 1819
- Joined: Dec 06, 2013
- Fri Nov 13, 2020 7:20 pm
#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
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