Inferences

The student government wants to survey the student body about whether they would like a vegetarian entree added to the daily lunch menu in the cafeteria. Which sample is most likely to be representative of the opinion of the entire school.

• Survey the first 30 students in the cafeteria line at lunch.

• Select 30 students randomly in the hallway during the change of periods.

• Survey all the students in the Animal Rights Club.

• Select 30 students randomly from among the students who bring their lunch to school 3 or more times a week.

Tags

CCSS.RL.11-12.6

Paul and Denise will collect data to find out where the 7th grade class should hold their end-of-the-year picnic.

Which group should Paul and Denise survey to collect the best data?

• 30 of their friends

• all of the students on the baseball team

• the first 20 students in the lunch line

• 10 randomly selected students from each of the four 7th grade classrooms

Tags

CCSS.HSS.IC.A.1

CCSS.7.SP.A.1

East Middle School is changing their school colors. Mr. Peters is conducting a survey to determine which colors the students prefer.

Which method would achieve the MOST accurate results?

• Asking eight random students from each classroom during second period which colors they prefer.

• Asking the members of the boys' soccer team which colors they prefer.

• Asking every seventh grade girl which colors they prefer.

• Asking the first ten students who enter school in the morning which colors they prefer.

Tags

CCSS.RL.11-12.6

Tanya is helping the 7th grade plan their field trip. She wants to know where the students would like to visit on their field trip.

Which is the BEST example of valid sampling?

• Asking Tanya's ten closest friends where they would like to visit

• Asking the players on the girls' basketball team where they would like to visit

• Asking the first five people in the lunch line where they would like to visit.

• Asking five students from each 7th grade homeroom where they would like to visit.

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3

Blaine works for a battery manufacturing company. He wants to develop a method to test the batteries made each day to determine if they work.

Which method would provide the MOST valid results?

• sampling the first 25 batteries made each day and testing to see if they work

• sampling the last 25 batteries made each day and testing to see if they work

• sampling the first 50 batteries made each day and testing to see if they work

• randomly sampling 50 batteries throughout the day and testing to see if they work

Tags

CCSS.RI.6.7

CCSS.RI.7.7

CCSS.RI.8.7

CCSS.RL.7.7

CCSS.RL.6.7

Two random samples of 100 Americans were surveyed about their favorite television programs.

What can be inferred from the data?

• A total of 25 Americans prefer dramas.

• More Americans prefer comedy than drama.

• More Americans prefer sports than comedy and drama combined.

• 47% of Americans prefer comedy.

Tags

CCSS.RI.6.7

CCSS.RI.7.7

CCSS.RI.8.7

CCSS.RL.7.7

CCSS.RL.8.7

The heights of five ambrosia plants, in inches, selected at random from a park with 50 ambrosia plants are shown below.

78, 118, 157, 39, 98

Which is a reasonable prediction of the mean height of all the ambrosia plants in the park?

• 9.8 inches

• 39 inches

• 98 inches

• 157 inches

Dr. Gilmore's research group tagged and released 800 squirrels for a study of a local park. Later, they trapped 430 squirrels, 43 of which had tags.

To the nearest whole number, what is the best estimate for the squirrel population?

• 43

• 80

• 370

• 8000

Farmers living in the countryside marked 50 goats and released them. The next day they 150 goats, 15 of which had marks.

What is the BEST estimate for the goat population in the countryside?

• 60

• 185

• 215

• 500

Lance surveyed his class to see how many students have pets. The results are shown in the table.

Which statement is true?

• Over 1/2 of students own a dog.

• Exactly 12% of students do not own a dog.

• About 1/4 of students own a hamster.

• About 20% of students own either a hamster or fish.

Tags

CCSS.6.RP.A.3C