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### Exercises
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1. What variables in `heights` do you expect to be most highly correlated with
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income? Use `cor()` plus `purr::map_dbl()` to check your guesses.
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income? Use `cor()` plus `purrr::map_dbl()` to check your guesses.
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1. Correlation only summarises the linear relationship between two continuous
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variables. There are some famous drawbacks to the correlation. What
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