You are trying to conduct a survey of students within a college community to see if you should cut funding to the athletics department to save money. Which of the following manners of conducting this survey would lead to the least bias possible?

The best way to reduce variability in an unbiased sample is to __________.

Identify the type of bias:

A radio station polls listeners on a controversial issue by talking to people who call in to the station.

Identify the type of bias:

A researcher wants to know whether students at a particular university have ever cheated on a test. The researcher walks up to 100 random students and asks them the following question:

"Have you ever cheated on a test or exam?"

To find the percentage of households in a town who own more than one motor vehicle, a survey will ask the next 100 drivers at a popular gas station if there is more than one motor vehicle in their household. Is this survey biased and if so, what is the main type of bias?

Identify the type of bias:

A researcher wants to know what proportion of people in the United States favor student debt reform. The researcher goes to five universities and at each asks people whether they favor student debt reform.

Identify the type of bias:

A researcher wants to know what proportion of coffee drinkers would pay more than $5 for a coffee drink. The researcher asks the following question:

"Do you agree that $5 is way too much to pay for a simple coffee"