Miguel Is Using His Scientific Knowledge to Examine Events in His

Multiple Choice

Miguel is using his scientific knowledge to examine events in his own life. He hypothesizes that mouthwash that "stings" does a better job preventing cavities than mouthwash that does not "sting." If he assigns 10 people to use the mouthwash that stings for 6 months and another 10 people to use the mouthwash that doesn't sting for 6 months, then he is conducting a:

A) between-subjects study.
B) nonexperimental study.
C) within-subjects study.
D) longitudinal study.