Biased Sample Random Sample

Which of these statements best describes a biased sample?

• It is very small.

• It is not randomly chosen.

• It results in incorrect predictions.

• It does not accurately represent the population.

Biased or Random?

Isaac wants to find out the favorite foods of students at Churchill. He asks the boys’ basketball team about their favorite foods.

• Biased sample

• Random sample

Biased or Random?

Jace wants to find out what the favorite soda flavor is at Churchill Middle School. He decides to ask all the students in Mrs. Shoemaker's class as a sample group.

• Biased sample

• Random sample

Teliciah wants to determine the most popular brand of cereal in all of California. So she polls all the houses on her street to get a sample.

• Biased sample

• Random sample

Mr. Goldsmith wants to determine who the best teacher in all of Menifee County is, so he asks every 7th grader who their favorite teacher is.

• Biased

• Random

Ms. Madson wants to know how many students will attend the next 7^th grade after school dance.  She places all the 7^th grade students’ names in a jar and selects 50. Is this random or biased sampling?

• Random

• Biased

John wants to find out what the favorite soda flavor is at Menifee County. He decides to ask all the students in Mr. Goldsmith's class as a sample group.

• Biased

• Random

At Centre Middle School, the 7th graders will conduct a survey to decide where they want to go on a field trip. Which method will result in the least biased decision?

• to randomly ask 8th grade students who went on a field trip last year

• to randomly choose some 7th grade students to select a location

• to ask all 7th grade teachers and administrators for a location

• to ask the Beta Club to choose a location

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

Cassandra and Isabella want to determine the favorite subject of all students in the middle school. So they place every middle school student's name in a bucket and choose 30 to poll.

• Biased

• Random