Biased and Unbiased Review

What type of survey sample is it when the entire population is being equally represented?

• Unbiased sample
• Biased sample

What type of survey sample is it when one portion of the population is favored over another?

• Unbiased sample
• Biased sample

What type of a survey is it when members of the population are chosen because they are easily accessible?

• Systematic Random Sample
• Convenience Sample
• Simple Random Sample
• Voluntary Response Sample

Determine if the conclusion is valid.
To evaluate the quality of their product, a manufacturer of cell phones checks every 50th phone off the assembly line.  Out of 200 phones tested, 4 are defective.  The manager concludes that about 2% of the cell phones will be defective.

• The conclusion is valid
• The conclusion is not valid

Tags

CCSS.7.SP.A.2

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

• Biased
• Unbiased

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

• Biased
• Unbiased

Tags

CCSS.RL.11-12.6

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.7.SP.A.1

CCSS.7.SP.A.2

Marcos wants to find out how many students at his school like to go to the movies. Which survey method is likely to produce a representative survey?

• Ask the boys in the boys locker room.
• Ask the 25 students in his homeroom class.
• Ask students coming out of a movie theater.
• Ask half of the 34 students on the soccer team.

Tags

CCSS.6.SP.A.1

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

• Biased
• Unbiased

Tags

CCSS.6.SP.A.1

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

• Biased
• Unbiased