Random Sampling Practice

A population is...

• The part of the group you want to collect data from

• Only ever made up of people

• The entire group from which a sample is chosen

• A group that only includes adults

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

Choose all that correctly finish the following sentence:

A sample:

• Is part of your population

• Is the same thing as the population

• Should be chosen randomly to ensure the best data can be gathered

• Must be include at least 1000 pieces of data

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

True or false: A random sample is one in which every event has an equal chance of being chosen and each event is chosen at random.

• True

• False

Tags

CCSS.HSS.IC.B.3

True or false: Having bias means having a preference for

one thing/person/outcome over another

thing/person/outcome.

• True

• False

Tags

CCSS.RL.5.6

True or false: Unbiased means NOT having a preference for

one thing/person/outcome over another

thing/person/outcome.

• True

• False

Tags

CCSS.RL.5.6

What does the word valid mean?

• Unreasonable and unjustifiable

• Reasonable and justifiable

Tags

CCSS.RI.7.8

CCSS.RI.8.1

CCSS.RI.8.8

CCSS.RL.8.1

CCSS.RL.9-10.1

During an after school practice, Diego surveys all the members of the football team about their favorite sport. The results are shown in the table.

From these results, Diego concludes that football is the favorite sport among all the students at his school. Which is the best explanation for why his conclusion might NOT be valid?

• The survey is biased because only randomly selected members of the football team should have been included in the survey.

• The survey is biased because it was not administered in two parts.

• The survey is biased because football players do not represent the interests of the entire population.

• The survey is biased because the sample did not include coaches.

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

The principal of a junior high school wants to know how many students like the current cafeteria food. Which method might the principal use to ensure a good representation of the population in his survey?

• On a day chosen at random, the principal asks the counselor to provide a list of student ID numbers and selects every tenth person on the list. He finds each student between classes to ask if they like the cafeteria food.

• On a day chosen at random, the principal goes to the cafeteria and asks the first 50 students who enter the cafeteria if they like the cafeteria food.

• On a day chosen at random, the principal walks through the cafeteria and asks students who brought their own lunch if they like the cafeteria food.

• On a day chosen at random, the principal walks through the cafeteria and asks students eating the cafeteria meal if they like the cafeteria food.

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

Billy wants to determine how many of the students in his eighth-grade class like to play video games. He stands in front of the school and watches as the students enter the school. When he sees an eighth grader whose name he knows, he asks if he/she likes to play video games. Is Billy's sample a good representation of the population?

• No, because Billy does not determine the grade of the students.

• Yes, because Billy surveys everyone in the eighth grade.

• No, because Billy only surveys students he knows by name.

• Yes, because he asks his survey question to eighth grade students.

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

The coaches of a school football team want to know how many families from the school plan to attend this week's game. Each coach takes a different approach to obtain this information. Which sampling method would provide a good representation of the population?

• Call all the parents of the football players to ask if their families will attend the game.

• Stop every fifth car that enters the school parking lot one morning to ask if their families will attend the game.

• Ask all the students in the last period PE class if their families will attend the game.

• Choose every fourth student from an alphabetical list of the entire student body and ask if their families will attend the game.

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1