Identify the most relevant source of bias in each situation.
A survey asks the following: Should the death penalty be permitted if innocent people might die?
A study seeks to investigate whether a new pain medication is safe to market to the public. They test by randomly selecting 300 people who identify as men from a set of volunteers.
A survey asks how many sexual partners a person has had in the last year.
A radio station asks listeners to phone in their response to a daily poll.
A substitute teacher wants to know how students in the class did on their last test. The teacher asks the 10 students sitting in the front row to state their latest test score.
High school students are asked if they have consumed alcohol in the last two weeks.
Lee et al., Math in Society, §3.1 Overview of the Statistical Process, Exercise 15