Chapter 5.1, Problem 5.2E

(a)

To determine

To explain what type of sample did the parade survey obtain.

Explanation of Solution

Voluntary response sample, because people have to be willing to go to the site and answer the question.

(b)

To determine

To explain why this sample method is biased and explain why is $85\%$ probably higher or lower than true percent of all adults who believe cell phone use while driving should be banned.

Explanation of Solution

  $85\%$ is lowerthan true percent of all adults who believe cell phone use while driving should be banned because only people with a strong opinion will tend to answer.