Correlation and Causation
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For each of the fifty states if you look at the state average income and the percentage of people in that state who are foreign-born immigrants, you will see a positive correlation.
Does this mean immigrants tend to earn more than other people?
Or does it mean immigrants improve a state's economy?
If not, what could explain the correlation?
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Because there is a positive correlation, we know that states with a high average income tend to have a higher percentage of immigrants, and states with a low average income tend to have a lower percentage of immigrants.
This could ...
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