Biased and Unbiased

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

• Biased

• Unbiased

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

• Biased

• Unbiased

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

• Biased

• Unbiased

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

• Biased

• Unbiased

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

• Biased

• Unbiased

To determine the most popular children’s programs, a television station asks parents to call in and complete a phone survey.

• Biased Sample

• Unbiased Sample

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

• Biased

• Unbiased

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

• Biased

• Unbiased

Carlos wants to know the favorite sport of people at his school so he asks his baseball team. What type of sample would this be?

• Biased

• Unbiased

To determine how many students plan to attend the school musical, Maria surveys 100 random people in the hallway.

• Biased

• Unbiased