Question

Which survey is most likely affected by bias

A) a server asking randomly selected bike riders if they wear a helmet or not.
B. a survey of supermarket shoppers about their favorite grocery store.
C. a survey of randomly selected students and teachers about the cell phone policy in their school district.

Answer 1

I would guess C, but I am not sure
The reason for this is because some students might strongly believe you should be allowed to have cell phones, but others are strongly against it
Sorry if I am wrong