Identifying Representative Random and Biased Samples

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

• Biased
• Unbiased

2.  A homeowner divides their backyard into 5 sections, and randomly removes soil from sections.

• 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

10. A senator wants to how she is doing.  She sends a survey to 1000 registered voters in her party

• Biased
• Unbiased

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

• Biased
• Unbiased

8. The owners of a music store asked 10 people who wanted help which new CD they liked best.

• Biased
• Unbiased