Exercise

Renaming a column after count

The rename() verb is often useful for changing the name of a column that comes out of another verb, such as count(). In this exercise, you'll rename the n column from count() (which you learned about in Chapter 2) to something more descriptive.

Instructions 1/2

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1
Use count() to determine how many counties are in each state.
2
Notice the n column in the output; use rename() to rename that to num_counties.