Population and Sample

True or False: all samples lead to a good prediction about an entire population.

• True

• False

A student wants to know which type of pizza the students at his high school prefer. Which option would give a unbiased, representative sample:

• Asking all the students in the hot lunch line.

• Asking 10 random students from each homeroom.

• Asking every other student who gets off a school bus.

• Asking all the 10th graders.

Population or Sample?

A survey of 1353 American households found that 18% of the households own a computer.

• Population

• Sample

_______ is the entire group of objects or individuals considered for a survey.

• Sample

• Random Sample

• Population  

• Quartile

A toy store owner tracking how much kids spend each month on toys. Which choice best represents a population?

• All of the kids who buy toys.

• 227 wealthy kids.

• 228 boys age 7 - 15

• 235 kids from age 10 to 15.

Which of the following is an example of a sample?

• All the students in your school

• Every tree in a forest

• Ten candies randomly picked from a jar

• All the cars in a city

A teacher randomly selects three students from each class to participate in a study about study habits. Is this:

• Biased sample

• representative sample

Emily surveyed a group of 30 students and found that 12 of them had pets. If there are 150 students in total, about how many students would you expect to have pets?

• 12 students

• 30 students

• 60 students

• 150 students

Tony sampled 40 cars in a parking lot and found that 8 of them were electric. If there are 100 cars in total, about how many cars in the parking lot are electric?

• 20 cars

• 40 cars

• 8 cars

• 100 cars

David collected data on 25 students' favorite colors and found that 5 of them preferred blue. If there are 300 students in total, about how many students would you expect to prefer blue?

• 25 students

• 30 students

• 45 students

• 60 students