Chapter 4, Problem 2CRE

(a)

To determine

To give an example of a way to choose a voluntary response sample of students and explain how this method could lead to bias.

Explanation of Solution

It is given in the question that a large student wants to gather student opinion about parking for students on campus. And it is not practical to contact all students. Thus, an example of a way to choose a voluntary response sample of students is that uses the daily announcements for volunteers to come in at lunch to take the survey. Thus, since voluntary surveys are generally responded to only by those who feel strongly about the issue, these results will likely be biased.

(b)

To determine

To give an example of a way to choose a convenience sample of students and explain how this method could lead to bias.

Explanation of Solution

It is given in the question that a large student wants to gather student opinion about parking for students on campus. And it is not practical to contact all students. Thus, an example of a way to choose a convenience sample of students that we could choose the first $50$ students who arrives on the camps parking lot in a day. Thus, this would then create bias because the first $50$ students will mostly likely have much different opinions about parking on campus compared to the other students who did not find any available spots to park.