Sampling and Population

Your school has received a grant to upgrade the school library. The librarians used a random sample of 50 students from the entire school. Of the 50 students, 27 would like to see more laptops available for student use. What can be inferred from this information?

• Exactly 46% of the students in the school would like to have an upgrade other than    laptops for the library.

• Most students in the school would like to have more laptops available in the library.

• About half of the students want the grant money to be used to buy more laptops for student use.

• Students who use the library the most need more laptops.

Tags

CCSS.7.RP.A.2C

Mr. Rodriguiz used a random sample of 20 students from each grade at Willowbrook School to determine their favorite types of reading material. He made a graph of the results. What can he infer from the results.

• Overall, students are less interested in reading magazines than comics.

• Students are less interested in reading comics than magazines.

• Students prefer magazines to books.

• 7th-grade students prefer books.

Tags

CCSS.7.SP.A.1

CCSS.7.SP.A.2

The basketball players at Rafael’s middle school are selling T-shirts, and he wants to determine the average number of shirts that have been sold. First he surveyed five members of the 7th-grade boys basketball team. Then he surveyed every third basketball player on the boys and girls 6th- through 8th-grade basketball teams. Which sampling technique should produce a more representative sample? 

• The first sampling method (7th graders) is the most representative.

• The second sampling method (6th–8th graders) is the most representative.

• Both samples should be exactly the same.

• Neither sample will be representative.

Tags

CCSS.7.SP.A.1

CCSS.7.SP.A.2

Jeremy wants to start a 7th-grade summer reading club at his middle school. He surveyed thirty 7th-grade students at the community pool. He asked each student how many books they had read during the month of July.

He obtained these results: 8, 5, 0, 1, 2, 3, 6, 3, 0, 4, 7, 4, 3, 3, 5, 2, 1, 3, 2, 1, 0, 4, 1, 2, 4, 2, 3, 7, 6, 0

What is the ratio of the total number of students who did not read books to the total number of students surveyed?

• 3/36

• 4/30 or 2/15

• 4/26 or 2/13

• 3/30 or 1/10

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.2

In this assignment, you will explore how to find the number of different species of fish in a pond by looking at a random sample of the fish.

Which phrase best describes the total number of brook trout in the pond?

• the population of brook trout

• the proportion of brook trout

• the sample of brook trout

• the population of fish

Tags

CCSS.7.RP.A.2C

The mean number of catfish in all 6 samples is approximately 5.7.  If 200 fish are in the pond, which proportion can be used to predict the number of catfish in the population?

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Tags

CCSS.7.RP.A.3

Six random samples were taken each year for three years. The table shows the inferred population for each type of fish for each year. Which conclusion is supported by the data from the multiple-year samples? Check all that apply.

• The number of bass increased over time.

• The number of bass decreased over time

• The number of catfish increased over time.

• The number of catfish remained the same.

• The fish population decreased over time

Tags

CCSS.7.SP.A.1

CCSS.7.SP.A.2