Question

Select all choices which could lead to a biased result. randomly calling telephone numbers to ask if people are satisfied with their service randomly calling people whose last name starts with ‘W’ to ask if they are satisfied with their service asking high school senior girls what they thought of their school randomly asking men if they like the feel of a certain towel

Answer 1

the phone one, because if they answered they are likely happy with it and the school one because seniors tend to be more inclined toward their own school.

Answer 2

3 and 4 because girls might like the school while boys don't and because men might hate the towel but women might love it.