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. the independent variable is ________. \bigcirc the number of collisions participants have \bigcirc driving \bigcirc thc (marijuana) use \bigcirc participant age

Explanation:

The independent variable is the factor manipulated by researchers to test its effect. Here, researchers assign participants to either a THC pill or placebo, so this is the variable being controlled to observe changes in collision numbers.

Answer:

THC (marijuana) use