Probe vehicles are used to monitor speeds of several freeway segments. Describe deviations from random sampling for each of the following: a. Probe-vehicle drivers are to stay in the middle of the...

Probe vehicles are used to monitor speeds of several freeway segments. Describe deviations from random sampling for each of the following:

a. Probe-vehicle drivers are to stay in the middle of the pack of vehicles with which they enter the freeway. b. Probe-vehicle drivers are to pick out a car of their choice and follow it at a safe distance. c. Probe vehicles are dispatched at a random time, to an intersection chosen randomly, and a computer randomly chooses which vehicle they are to follow at a safe distance.