Biased and Unbiased Samping

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

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

• Biased
• Unbiased

Tags

CCSS.7.SP.A.1

CCSS.7.SP.A.2

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

• Biased
• Unbiased

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3

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

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

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