Clarify exercise, closes #1543
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@ -751,7 +751,7 @@ Each stat is a function, so you can get help in the usual way, e.g., `?stat_bin`
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4. What variables does `stat_smooth()` compute?
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What arguments control its behavior?
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5. In our proportion bar chart, we need to set `group = 1`.
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5. In our proportion bar chart, we needed to set `group = 1`.
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Why?
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In other words, what is the problem with these two graphs?
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