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Can someone please explain how did we get C as correct AC. We don't have to have same totals in order to get same percentages. Why does this question requires us to make this assumption? Thank you!
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boys <10 2x likely to get it
boys less likely to outgrow it
lots of girls get it in early adolescence
same % boys/girls by adolescence
Therefore # adolescent boys w/it = # adolescent girls w/it
So boys start off with a higher percentage and the disparity is maintained until it closes as a result of an increase in girls getting asthma in early adolescence.
If you know there is a similar # in each population, you could reasonably conclude the ending #s would be close as well.
This is not a required assumption... remember that would be a necessary assumption. Here we are asked to find something that leads us to the conclusion provided in the stem, a sufficient assumption. Its a pretty loose answer... very MSS-like, which you see in a lot of the earlier content, but the others are trash.
Thank you so Much!