Answer:
By comparing the numbers he gathers on both groups, Roger will most likely be using quantitative research.
Explanation:
Roger will be comparing the numbers he gathers on both groups, and that is an example of quantitative research. This type of research works with numerical data (numbers). For that reason, it relies on mathematics, computations, and statistics to visualize the results. Its goal is to quantify something. On the other hand, qualitative research works with more abstract concepts.