Understanding Representative Samples

Is this biased?

People riding the bus were asked how many cars they own.

• Yes

• No

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

A 7th grade ELA teacher wants to order books for all of the 7th grade classes. He wants to determine the favorite type of book among the 7th grade students. Which sample would be the most appropriate for this survey?

• 7 girls in each of his classes

• Every 5th student in the 7th grade

• All of the boys in one of his 7th grade classes

• 1 out of 7 students in his middle school

Tags

CCSS.RL.11-12.6

Is this biased?

People walking out of the AT&T store were asked if they use a cell phone.

• Yes

• No

A middle school principal wants to change the lunch menu at the school. The principal surveys the students to determine how the students would feel about the changes. Which survey method will produce the BEST representative sample?

• Survey every 10th seventh grade student during lunch

• Survey 3 randomly selected students from every homeroom

• Survey 5 randomly selected students from every art, drama, and music class

• Survey every 5th student who rides in a car to school

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

Jayla wants to know the favorite sports team of the adults in her city. Which survey method is representative of the population?

• Randomly survey 1000 adults as they leave a professional basketball game.

• Randomly survey 2000 adults in one neighborhood.

• Survey every 100th adult customer who enters the local grocery store.

• Survey every 20th student who enters the high school.

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

A school principal wants to determine which type of speaker the students prefer to invite to an assembly for the entire student population. Which survey method would produce the BEST representative sample?

• Survey every 5th person who shops at a mall

• Survey every 10th student entering the school one morning

• Survey all of the students who went to the last basketball game

• Survey all of the students on the student council

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

A city librarian wants to see if visitors want to add a cafe to the library. On a Monday morning, the librarian surveys every 4th visitor to the library. Is this sample likely to be representative of all library visitors?

• Yes

• No

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

Is this biased?

Every 40th student who enters the school is asked to name their favorite sport.

• Yes

• No

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

Students study all of the crickets in their school yard. They rope off a square meter of space in a field and count the number of crickets in their square. What is the sample in this situation?

• All of the crickets in their square

• All of the crickets on the school yard

• All of the crickets in the field

• All of the crickets outside of the science classroom

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

Georgia surveyed some of her friends at Jones Middle School about their favorite type of music. Based on their responses, Georgia concludes that the favorite type of music among all middle school students is rock music, followed by pop music.

• Is Georgia's conclusion valid?

• Explain.

Tags

CCSS.RI.6.1

CCSS.RI.7.1

CCSS.RI.8.1

CCSS.RL.6.1

CCSS.RL.7.1