30,000 people participated in an online poll on cnn.com conducted in April 2012 asking Have you ever driven with a pet on your lap? 34% of the participants answered yes and 66% answered no.

(a) Can we conclude that 34% of all drivers have driven with a pet on their lap?

(b) Explain why it is not appropriate to generalize these results to all drivers, or even to all drivers who visit cnn.com. What is the problem with this method of data collection?

(c) Is the variable in this study quantitative or categorical?