Your assignment calls for you to use quantitative data to support your arguments. You can trace the original data sources used by articles in your literature review, or find your own data. This page has some helpful sources.
Finding statistical data can be complex, so don't hesitate to call me for help.
There are many things to consider as you seek data or statistical information: frequency, geography, topical area, etc. Download the linked worksheet for some guidance.
Go to this guide for many more statistical data resources:
These guides are from other universities. You may hit a pay wall while exploring some of their resources: check with me to see if we have access to that content.