The file P02_05.xlsx contains monthly values of the Dow Jones Industrial Average from 1950 until recently. It also contains the percentage changes from month to month. (This file is used in an example later in this chapter.) Create a new column for recoding the percentage changes into six categories: Large negative (<-3%), Medium negative (<-1%, ≥-3%), Small negative (<0%, ≥-1%), Small positive (<1%, ≥0%), Medium positive (<3%, ≥1%), and Large positive (≥3%). Then create a column chart of the counts of this categorical variable. Comment on its shape.