When Guthrie, Ash, and Bendaudi (1995) investigated whether students' grades and their tendency to be morning or evening people are associated, these investigators conducted
a. a prediction study.
b. a relationship study.
c. analysis of heterogeneous subgroups.
d. multiple regression.
Question 2
When researchers offer inducements, like money, so a member of a hidden population would go out and actively recruit others in that population for participation in a study, the sampling involves
a. key informant sampling.
b. snowball sampling.
c. targeted sampling.
d. respondent-driven sampling.