Steve is playing peekaboo with his 4 month old son. When Steve decides to hide behind the couch, his son quickly lose interest and goes back to play with his toy. why does the baby lose interest?

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.

if you know your abc's you should be able to get your answer or just use google