Bad sampling A large high school wants to gather student opinion about parking for students on campus. It isn’t practical to contact all students.

(a) Give an example of a way to choose a voluntary response sample of students. Explain how this

method could lead to bias.

(b) Give an example of a way to choose a convenience sample of students. Explain how this method could lead to bias.

A large student group wants to hear from students regarding parking on campus.

The random assignment method assigns subjects to treatments based on chance. Before the treatments are applied, random assignment establishes treatment groups that are comparable (except for chance variance). In experiments, randomization and comparison combined prevent bias or systematic favoritism.

It is stated in the inquiry that a significant student wishes to obtain student feedback on campus parking. Furthermore, contacting all pupils is impractical. As an example, using the daily announcements for volunteers to come in at lunch to take the survey is one technique to select a voluntary response sample of students. As a result, because volunteer surveys are typically filled out by people who are passionate about a topic, the results are likely to be skewed.

It is stated in the inquiry that a significant student wishes to obtain student feedback on campus parking. Furthermore, contacting all pupils is impractical. As an example of how to select a convenient sample of students, we could select the first 50 students who arrive at the camp parking lot each day. As a result, there will be prejudice because the first 50 students will likely have many different ideas regarding parking on campus than the remaining students who were unable to secure a parking spot.