Random vs Biased Samples

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.

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

Biased or Random?

Chloe and Danna 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 sample

• Random 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

David wants to find out what the most popular pet in all of Dallas, so he puts every student's name into a bucket and polls 30 students.

• Biased sample

• Random 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

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

An airline wants to know if people prefer to check their luggage or carry it on. They ask every 10th person that walks into the airport. Is this a biased sample or unbiased sample?

• Biased Sample

• Unbiased sample?

A sample in which every person, object, or event has an equal chance of being selected.

• Random sample.

• Biased sample.