Random Samples and Biased Questions

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.

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

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

Audi wants to find out how students get to school at Churchill so she places the names of all students into a fish bowl and pulls out 50 so she can survey them.

• Biased sample

• Random sample

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

Random or Biased...
You want to know what percentage of Maui people that go Oama fishing so you ask every 5th person you see at Kanaha Beach early in the morning... 

• Random

• Biased

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

Random or Biased...
You want to know what percentage of students are in afterschool programs, so you get a list of all students and ask every 4th person on the list.

• Random

• Biased

Biased or Random?

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

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