Population, Surveys, and Samples

Jason wants to know if students prefer football or baseball. He surveys the entire football team.

Is this survey biased or unbiased? Why?

A principal wants to know which holiday teachers prefer. He emails 10 randomly selected teachers from each grade.

Is his survey biased or unbiased? Why?

A dog food company wants to know what type of treats dog lovers prefer for their dogs. They ask 25 dog lovers who have shopped in their store in the past month.

Is this survey biased or unbiased? Why?

Darren wants to know whether 7th graders prefer music, art, or sports. He generates 150 random 7th grade names from the school enrollment and surveys those students.

Is his survey biased or unbiased? Why?

Why is it difficult to survey an entire population? Select all true answers.

• People love taking surveys and always respond.

• It can be very expensive.

• People dislike taking surveys and some don't respond.

• Surveys have a near 100% response rate.

• Some members of the population could be hard to reach.

A sample is only representative of a population if it is large enough and __________.

Select the two ways that surveys are often randomized.

• Survey the first half of the population.

• Random number generator.

• Every nth member of the population.

• Choose to survey members of the population who have written a review about the topic.

In a survey, 5 responders chose rabbits as their favorite animal. If there were 25 responders, what percentage chose rabbits?

• 50%

• 25%

• 32%

• 20%

6 members of a sample selected brownies as their favorite dessert. There were 60 total members in the sample. What percentage prefer brownies?

• 15%

• 90%

• 6%

• 10%

All members of a particular group is a...

• Sample

• Population

• Bias

• Random