1. Are any vendors used that are not approved vendors? If so, list the vendor names and the employees who used these vendors. What follow-up steps should be taken on these vendors?
2. Were any vendors unused by the purchasing department? What does this fact tell us about these vendors?

Import the ch06_charges.tsv and ch06_approved_vendors.tsv data sets into your analysis software. These files give a list of purchases and vendors that are approved for use, respectively.