Question 4 of 10
A scientist designs an experiment to test the effect of the speed limit on how
fast people drive. Each day, he changes the speed limit on a certain street by
five miles per hour and records the average speed of the cars on that street.
What is the manipulated variable in this experiment?
OA. The number of cars on the street
OB. The speed limit
OC. The average speed of the cars
OD. The size of the road
