10.2 Biased and Unbiased Samples

What type of sample is this?

A survey is conducted where every 9th person to walk into a department store is asked a series of questions.

• Systematic Response Sample

• Simple Random Sample

• Voluntary Response Sample

• Convenience Sample

What type of sample is this?

A person stands in a crowded park and asks whoever is nearby to answer a series of survey questions.

• Systematic Response Sample

• Simple Random Sample

• Voluntary Response Sample

• Convenience Sample

What type of sample is this?

A random survey is conducted in an office building about the satisfaction of the office amenities.

• Systematic Response Sample

• Simple Random Sample

• Voluntary Response Sample

• Convenience Sample

What type of sample is this?

A magazine conducts a survey asking readers to go to their website and answer a series of questions about health and beauty.

• Systematic Response Sample

• Simple Random Sample

• Voluntary Response Sample

• Convenience Sample

What type of sample is this?

A credit card company emails their customers and asks them to click a link to take a 20 minute survey on customer satisfaction.

• Systematic Response Sample

• Simple Random Sample

• Voluntary Response Sample

• Convenience Sample

A valid conclusion can be made from a biased survey.

• True

• False

A bias in statistics means that there has been an error that affected the results.

• True

• False

Biased or Unbiased?

• Biased

• Unbiased

A TV producer wants to do a survey to find out which reality show is the favorite of viewers in Omaha, NE. Which of the following is the most unbiased sample?

• Sample 1

• Sample 2

• Sample 3