6. Random is used to increase the representative- ness of one's sample, whereas random is used to help eliminate a potential confound: differences between people. a. sampling; selection b. assignment; selection c. sampling; assignment d. assignment; sampling 7. Asking people to fill out a self-esteem questionnaire would be an example of research, whereas asking people to describe, in words, how positively they regard themselves would be an example of. a. correlational; qualitative b. correlational; quantitative c. quantitative; qualitative d. qualitative; quantitative 1. research. 1.