7th Grade Math Unit 5: Inferences

The drama club wants to estimate the number of students who will attend the school play. The president of the club asks 20 of her friends if they are going to the play. She learns that 13 of them plan to attend the play. What could the president do to make it more likely that her estimate will be closer to the actual number of students who attend the

play?

• ask 20 more of her friends if they are going to the play

• ask the last 20 students in the cafeteria line if they are going to the

  play

• ask every 20th student on a list of all the students in the school if

  they are going to the play

• ask the members of the drama club to each ask 20 of their friends if

  they are going to the play

Your school newspaper is conducting a survey to find out which school sports team is most popular.  How would it most likely get a random sample from the student population?

• By asking every fifth person entering the basketball game
• By asking 10 students from every homeroom
• By asking the parents
• By asking the students on the pep club

Which club has the smaller spread?

• Cruisers
• Car Hops

Jamal put the names of all students into a bin, and then drew 15.  Which statement is correct?

• This is not a random sample – not every   student has an equal chance to win.
• This is a random sample – every student   has an equal chance to win.  

A  number that is either MUCH larger or MUCH smaller than the rest of the numbers is a(n)

• outlier
• inlier
• lier
• I'm lying

Identify the Population:
Members of the Drama Club plan to sell popcorn as a fundraiser for their Shakespeare production. They survey 75 students at random about their favorite flavors of popcorn. 33 students like butter, 15 like cheese, and 27 like caramel.

• 33 Students
• 75 Students
• All Students
• 27 Students

What is the mode of the data set: 2, 4, 5, 5, 8, 9, 10, 12, 12

• 5 and 12

• 5

• 2

• 12

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

Biased or Random?

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

• Biased

• Random

The probability of a video game being defective is 1 out of 20. About how many video games would be defective in a shipment of 490 video games? (Round your answer to the nearest whole number.)

• 490

• 25

• 98

• 100

• 50