Awoman with ab blood type and a man with blood type o have three children, one of whom is adopted. the blood types of the children are a, b, and o. what is the blood type of the adopted child?

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.