What is one technique used to gather both qualitative and quantitative data in the same interview?

What is one technique used to gather both qualitative and quantitative data in the same interview?
in order to create a research-based argument on the topic of your choice. Your argument could be focused on a local, regional, national, or international issue.
Helpful Information
Use the ‘lens approach’ to offer a well-rounded view of your issue
Sources can be from printed publications, the web, and/or Raptor Search

Ensure your paper follows one of the five Argument Strategies
Consider utilizing one introduction strategy we practiced in class
Analyze both qualitative and quantitative data
Your claims should follow a clear line of reasoning
Avoid using Argument Fallacies in your wiring
Aim for a ‘balance’ between your own words and your source material
Requirements
4-6 pages in length + Works Cited with at least 5 sources. (Works Cited does not count toward page requirement)
Paper must be in MLA Format v. 9.0
Include at least one paragraph that addresses the counterargument or rebuttal