Identifying Representative Random and Biased Samples

All students' names have been placed in a bowl. To determine what the favorite subject is of JDMS students, Mrs. Brantley draws out 100 names and asks those students what their favorite subject is. Is this representative or biased?

• Representative Sample

• Biased Sample

Middle school students are chosen at random to determine the average shoe size of middle school students.

• Representative Sample

• Biased Sample

Lester bought 2 eggs from each farmer at hte farmers' market. Each farmer had an equal number of eggs. Is this representative or biased?

• Representative Sample

• Biased Sample

To find out the favorite candy of JDMS students, Coach Williams asks the wrestling team which is their favorite candy. Is this representative or biased?

• Biased Sample

• Representative Sample

Debbie surveyed all the students who ride the bus to school to find how long they take to get ready in the morning. Is this a biased sample or unbiased sample?

• Biased Sample

• Unbiased Sample

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

The sample represents the population.

Choose the answer that says "Representative Sample"

• Random Sample

• Biased Sample

• Representative Sample

A survey was distributed to determine food preferences for Middle School students. Which sample is most the representative for this survey?

• A group of High School students during a PE class.

• A group of parents of local Middle School students.

• 10 Elementary School students from each of the 5 local Elementary Schools.

• 20 randomly selected students from 6th, 7th, and 8th grade from each local Middle School.

Green Valley Middle School conducted a survey of 125 random students asking them how much time they spend each night on homework. Is this a biased sample or unbiased sample?

• Biased Sample

• Unbiased Sample

Casey surveyed the members of his soccer team to ask them what their favorite sport is. Is this a biased sample or unbiased sample?

• Biased Sample

• Unbiased Sample