Question

imagine you are collaborating with researchers studying the effect of marijuana on driving. participants are assigned by chance to either a) receive a pill that contains thc, the active ingredient in marijuana, or b) a harmless placebo pill. neither the researchers nor the participants know who is getting which pill. after taking the pill, participants are asked to drive a computerized driving simulator. the number of collisions participants have is measured. this study uses a(n) ____________ design. ○ correlational ○ experimental ○ descriptive ○ observational

Explanation:

This study uses random assignment of participants to two controlled conditions (THC pill vs. placebo), includes a manipulation of an independent variable (THC exposure), and uses a double-blind setup to control for bias. These are core features of an experimental design, which tests causal relationships. Correlational, descriptive, and observational designs do not involve active manipulation or random assignment of variables.

Answer:

experimental