A researcher is studying college performance as measured by graduating GPA and wants to make sure he has equal numbers of participants based on ethnicity. In order to do this he creates groups based on ethnicity and then randomly draws people from those groups until he has 50 of each category. This researcher does this because he wants to ensure he has an equal amount of representation from each group in his sample. Categories Asian Caucasion African American Native American Hispanic Other Question: What type of sampling is the researcher using