Statistics Test Review

A middle school has 6^th, 7^th, and 8^th grade students. Which of the following would be a random sample of the students?

• A.) survey all of the teachers

• B.) surveying the students who buy their lunch in the cafeteria

• C.) surveying everyone whose last name begins with a G

• D.) surveying every tenth student who is on the class rosters

Every time a customer purchases a new computer, one month later they receive a survey in the mail. Eighty-five percent of the surveys stated that the customer had no technical issues.

The people that return the survey are considered…

• A.) the population

• B.) the sample

A new restaurant in town is surveying residents to determine how much they typically pay for a meal out. Which of the following best describes a random sample?

• A.) They go door-to-door in a nearby neighborhood.

• B.) They randomly select 50 residents of a local nursing home.

• C.) They call 200 randomly selected town residents.

• D.) They ask patrons if the price was reasonable.

4. Which of the following groups is NOT considered a sample of the United States population?

• A.) women who live in the United States

• B.) people who are registered to vote in the United States

• C.) Europeans who vacation in the United States

• D.) students who attend public schools in the United States

5. A teacher is investigating the amount of time students in Adams Middle School spend exercising. Identify the population.

• A.) all students in the school

• B.) all seventh-grade students in the school

• C.) seventh-grade students in Mrs. Howell’s 4^th period math class

The dot plot below represents the number of dollars in allowance that students receive each week in Mrs. Jimenez’s class. What is the median amount of allowance?

• A.) 5

• B.) 6

• C.) 7.5

• D.) 8

7. Compare the box-and-whisker plots below. Which of the following statements is NOT true?

• A.) Class B has a greater median of siblings.

• B.) Class A has a greater interquartile range.

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

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

8. Two friends measure the distance a race car travels over 10 trials. Which of the conclusions best supports the dot plots?

• A.) Both Jamal and Kendall’s race cars had the same range in their data.

• B.) On average Kendall’s race car traveled further.

• C.) The median distance Jamal’s race car traveled was 6.5 feet.

9. What is the range of the data values represented by the box-and-whisker plot?

• A.) 45

• B.) 30

• C.) 25

• D.) 15

10. What does the box-and-whisker plot tell you about people’s viewing habits?

• A.) About half the viewers watched 45 hours per week.

• B.) More viewers watched 35 hours per week than 20 hours per week.

• C.) Most of the viewers watched 25 hours per week.

• D.) About half the viewers watched between 20 and 35 hours per week.