An experimenter determined whether children would be assigned to an intervention group or a control group based on the school they attended. This approach may have introduced systematic variation that had nothing to do with the intervention, called , due to non-random assignment.

Im pretty sure it would be climax

Ithink its a im not sure 

Is this english or something else

The move over law is for safety of yourself and the officer and the ones pulled over, as a driver pulling over the officer control the situation with the pulled over person.

if it is an ambulance or fire truck with their sirens on it means they are having to get to an emergency so for the others safety for the emergency to save lives, pulling over lets them get through.

i hope this : )