You see a classmate in front of the art building occasionally stopping students and asking them questions. He happens to stop you, and you ask what he’s doing. He says that he is working on an assignment for his statistics class. He is collecting student opinions about the college. However, he only has time before his art class to conduct the survey. You tell him that he should use a random sample instead of occasionally stopping students as they enter the art building. He replies, "Why should I use a random sample? This is so much easier." Which of the following statements should you include in your explanation? Check all that apply.

a. If you use a random sample, you are more likely to avoid bias in the survey results.
b. In a random sample some members of the student population are less likely to be selected than others.
c. A random sample will be representative of the student population.
d. A random sample allows you to draw conclusions about the opinions of all students at your college.