Which of the following sampling methods would bias the set of responses? Select all that apply.

Question

A: asking people to return a mail-in card

B: tossing a chipped number cube

C: calling people between 3:00 P.M and 4:00 P.M

D: interviewing pet owners about their pet’s health

Answer 1

I think all 4 would bias the set of responses in some way:

A: asking people to return a mail-in card (only people with access to mail could reply)

B: tossing a chipped number cube (only people who are 'tech savvy' would understand what to do)

C: calling people between 3:00 P.M and 4:00 P.M (only people who are home at that time could be contacted)

D: interviewing pet owners about their pet’s health(only people with pets would be eligible to participate)