Bias vs. Unbiased

1.  Carlos wants to know the favorite sport of people at his school so he asks his baseball team.

• Biased
• Unbiased

7. A public library asked every 10th person who entered to name the type of book they were getting

• Biased
• Unbiased

3.  A hospital wants to open a gym. They ask the night-shift ER staff when they would use the gym.

• Biased
• Unbiased

4. A company makes DVDs and randomly selects 25 from 1500 to test them to see if they work.

• Biased
• Unbiased

6. To see who has a computer at home the front office chooses 10 students randomly per grade to ask

• Biased
• Unbiased

5. The first 100 people at the park Thursday were asked if dogs should be off leashes in the park.

• Biased
• Unbiased

9. A radio hosts wants to know where his listeners go for vacation.  He takes 10 phone calls

• Biased
• Unbiased

Ana wants to know the average student’s opinion of the tardy policy at her school. Which group of students should she survey in order to achieve the most accurate results?

• thirty students who are often tardy
• thirty students who are rarely tardy
• thirty of her friends
• thirty randomly selected students from her school

Tamra wants to know how tall college basketball players are in Nebraska, so he asks for the heights of all the players on the Creighton basketball team.

• Biased

• Unbiased

Erick wants to know how many hours of sleep college students get, so he surveys the 12 students in the front row of his college English class.

• Biased

• Unbiased