Understanding Representative Samples and Populations

Another word for a "smaller group"

is

SUBSET

Your sample is a subset of the population.

Which answer describes a sample?

• A sample is a SUBSET selected from the population

• A sample is the entire population

• A sample is a larger group than the population

What makes a sample representative?

• The sample is representative if it includes people from all over the world

• The sample is representative if it includes people from the same town

• The sample is representative if it includes people from the same country

• The sample is representative if it accurately reflects the group it is supposed to represent

There are 30 people. 11 are picked to take a survey. What is the sample?

• All 30 people

• The 11 people who take the survey

• The 19 people who do not take the survey

If the population is ALL 7th Graders

Then you want to take a sample from ALL 7th graders.

A sample is part of the population but not all of it.

Select the one below that is true

• A sample is a smaller group selected from the population

• A sample is the entire population

• A sample is a larger group than the population

• A representative sample is not related to the population

If the population is ALL 7th Graders Then you want to take a sample from ALL 7th graders. A sample is part of the population but not all of it. Select the one below that is true

• A sample is a smaller group selected from the population

• A sample is the entire population

• A sample is a larger group than the population

• A representative sample is not related to the population

• population

• sample

• u

Which choice best represents a population?

• All of the kids who buy toys.

• 227 rich kids.

• 228 boys age 7-15.

• 235 kids from age 10 to 15.

The sample should REPRESENT the population so you can INFER what the larger group is like.

If you take a BAD sample, it does not allow you to make inferences about the larger population.

Choose the option below that says "Biased Sample"

• A sample that accurately represents the population

• A sample that is selected randomly from the population

• Biased Sample

BEWARE: Your sample does not allow for someone in China to be represented. If you survey students in your town then your population is limited to students in your town. What makes a sample representative?

• The sample is representative if it includes people from all over the world

• The sample is representative if it includes people from the same town

• The sample is representative if it includes people from the same country

• The sample is representative if it accurately reflects the group it is supposed to represent

Is the survey biased or unbiased? Each student's name is written on a piece of paper. The names are placed in a bowl, and names are picked without looking.

• Biased

• Unbiased