A professor wanted to find out whether students enrolled in her ...

[moongchi]

A professor wanted to find out whether students enrolled in her statistics class would like her to increase her office hours. She plans to take a random sample of 20 students among those coming to class on the next lecture day. Explain what the difficulty with her method is.

Question 2

A short questionnaire is to be given to a sample of people. The questionnaire involves the topic of abortion. The woman who will hand out the questionnaire is a big pro-life supporter and on the day of the survey shows up with pamphlets and picket-signs expressing her opinion. What type of bias may this cause?
 a. Selection bias
  b. Response bias
  c. Non-response bias
  d. Volunteer bias

[mariahkathleeen]

Answer to Question 1

Her sampling frame is all students who came to that lecture. Since not all students come to every lecture, she used the wrong sampling frame.

Answer to Question 2

B