Ian Walker, a psychologist at the University of Bath, wondered whether drivers treat bicycle riders differently when
Question:
Ian Walker, a psychologist at the University of Bath, 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. Out of 2500 cars passing him, he found that when he wore his helmet, motorists passed 3.35 inches closer to him, on average, than when his head was bare.
[NY Times, Dec. 10, 2006]
Identify the variables and tell whether each should be treated as categorical or quantitative. Select ALL that apply.
Helmet; Categorical
Distance; Categorical
Speed; Quantitative
Distance; Quantitative
Speed; Categorical
Helmet; Quantitative
Introduction to Business Law
ISBN: 9780324826999
3rd Edition
Authors: Jeff rey F. Beatty, Susan S. Samuelson