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A researcher wondered whether drivers treat bicycle riders differently when they wear helmets. He rigged his bicycle with an ultrasonic sensor that could measure how close each car was that passed him. He then rode on alternating days with and without a helmet. Of the 30003000 times that a car passed​ him, he found that when he wore his​ helmet, motorists passed 3.273.27 inches closer to​ him, on​ average, than when his head was bare. What is the WhoWho in this​ study? That​ is, identify the cases under study.
A. The bike riders
B. Each instance of a car passing a rider
C. Bike helmets
D. The cars

Respuesta :

Answer:

In this case study we have following groups:

1. Population: It had all the cars which passed the bicyclist. Out of which 3000 cars were taken.

2. Who:  Each instance of a car passing a rider, means the drivers passing by.

That is the 3000 cars which passed the researcher on his bicycle.

3. What: The distance at which cars pass the bicycle rider. The distance the drivers stayed away from his bike.