Biased & Unbiased Surveys

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

• Biased
• Unbiased

Tags

CCSS.7.SP.A.1

To determine how often people eat out, every tenth person entering a Chinese restaurant is surveyed.

• Biased Sample

• Unbiased Sample

Tags

CCSS.HSS.IC.B.3

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

• 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

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

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.4

To determine the most common injury cared for in an emergency room, a reporter goes to the same hospital every afternoon for one month during the summer and observes people entering the emergency room. She concludes that second degree sunburn is the most common injury.

• Unbiased

• Biased

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3

To get valid results, a sample must be...

• biased

• unbiased

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.4

CCSS.HSS.IC.B.5

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

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.4