1 Before we run our correlations and regressions, we need to clean our data and prepare it for different types of regressions. All of the changes should be made in and saved as the `avocados` dataframe. First, remove all rows for regions at the city and state level and the entire United States. Hint: look at the `region` column for values that do not indicate a region related to city or state; there are eight regions that should remain