Staar Review Data and Statistics

Compare the two box plots below. Which of the following statements is NOT true?

• Class B has a higher median number of siblings.

• Class A has a greater variability in the number of siblings.

• Both Class A and Class B have students who are only children.

• Over half of the students in Class A have two or more siblings.

Mrs. Moore's and Mrs. Ruiz's classes are competing for the best cores on their math test. Which of the following statements does not represent the data?

• The scores in Mrs. Ruiz's class have less variability than the scores in Mrs. Moore's class.

• The median of Mrs. Moore's class is equal to the first quartile of Mrs. Ruiz's class.

• The interquartile range of both classes is equal.

• The scores in Mrs. Moore's class have a greater spread than the scores in Mrs. Ruiz's class.

Which of the following represents the difference in the centers of Mrs. Moore's class and Mrs. Ruiz's class?

• 7

• 11

• 4

• 3

At the zoo, the length of each iguana is measured. Which statement is best supported by the information below?

• Over half of the iguanas measure 14 centimeters or more in length.

• 25% of the iguanas measure 12 centimeters in length.

• The number of iguanas that measure 15 centimeters or more is equal to the number that measure 11 centimeters or less.

• A

• B

• C

• D

The heights of students in a class are recorded in a data table. If the mean height is 150 cm, and one new student with a height of 160 cm joins the class, will the mean height increase, decrease, or stay the same?

• Increase

• Decrease

• Stay the same

• Cannot be determined

In a survey of 40 students, 18 students said they participate in sports, while the rest do not. What percentage of the students do not participate in sports?

• 45%

• 55%

• 65%

• 35%

The table below shows the number of students in each grade at a school: | Grade | Number of Students | |-------|--------------------| | 6th | 120 | | 7th | 150 | | 8th | 130 | What is the total number of students in the school?

• 300

• 400

• 450

• 500

A random sample of 40 students from each grade level was surveyed regarding their preference for a class field trip.

What percent of students surveyed preferred going to the zoo for their class field trip?

Mathematical Equivalence

ON

A random sample of 40 students from each grade level was surveyed regarding their preference for a class field trip. Based on the information in the table, which inference is true?

• 8th graders wanted to go to the zoo more than 7th graders wanted to go to the museum.

• More 8th graders than 7th graders want to go to the sports complex.

• 7th and 8th graders preferred going to the zoo over the museum and sports complex.

• More 8th graders wanted to go to the museum or sports complex than 7th graders wanted to go to the zoo or sports complex.