7th Grade Bootcamp SP 1-8 Review

Kate conducts a survey at her middle school to determine the students' favorite sport. Which sampling method would best produce a representative sample of the population?

• A. Kate surveys the football team.

• B. Kate surveys seventh grade students.

• C. Kate surveys every 4th student entering the school.

• D. Kate surveys every 8th student from a roster of the choir members.

Mr. Harris wants to find out if the new tardy policy is effective. Where should he conduct his research to ensure an unbiased survey?

• at the school entrance after the bell rings to signal the beginning of school

• at Saturday School where tardy students are assigned after 6 tardies

• at the school entrance before the bell rings to signal the beginning of school

• at the next parent-teacher meeting

Luzminda takes a survey to find out what snack food students like in her elementary school. How should she collect the data to get the most accurate information?

• approach students in the hall at lunchtime to fill out a questionnaire

• have students put up their hands to vote for certain choices

• leave a pile of questionnaires in the hallway for students to pick up and fill in

• get a random sample of students from each grade to fill out a questionnaire

Diane decides to find out what snack food students like at her elementary school. What should she do to get the most accurate information?

• ask her friends

• take a survey among the girls in her class

• take a survey among students in each grade

• find out what was ordered last year

A spinner face is divided into 8 sections and each section is either blue, orange, black, or pink. The spinner is spun 24 times and the results are shown in the chart. How many sections of the spinner would you expect to be black?

• 1

• 2

• 5

• 6

A company manufactures cell phones. In August, a random sample of 125 cell phones was inspected, and 3 phones were found to be defective. The company manufactured 8,000 cell phones in August. Based on the results from the sample, about how many cell phones are expected to be defective?

• 64 cell phones

• 192 cell phones

• 2,667 cell phones

• 3,360 cell phones

Which statement correctly compares the two data sets?

• A. The median in August is about half of the median in November.

• B. The median in November is about 400 more than the median in August.

• C. The difference in the medians is about half of the range in November.

• D. The difference in the medians is about half of the interquartile range in August.

Ryan created the line plots to determine overlap between laps completed during 8th Grade Fitness Day and 6th Grade Fitness Day. Which of these describes the overlap of the two data sets?

• Both grades had students that completed between 1 and 3 laps.

• Both grades had students that completed between 4 and 9 laps.

• Both grades had students that completed between 6 and 15 laps.

• No overlap. The two grades had completely different numbers of laps completed.

Victoria lives in Vermont and her cousin, NaDalia lives in North Dakota. The girls researched population distribution in the two states and displayed the data in a graph. Compare the data sets.

• A. The urban population of Vermont is about 2 times the urban population of North Dakota.

• B. The total rural population of the states is less than half the total urban population of the states.

• C. The rural population of Vermont is about half the rural population of North Dakota.

• D. The urban population of Vermont is about 3 times the urban population of North Dakota.

Describe the variability between retirement savings for the younger and older age groups.

• The savings rate of the young was less than half the savings rate of the old.

• The savings rate of the old was double the savings rate of the young.

• The savings rate of the old was less than half the savings rate of the young.

• The savings rate of the old was more than 3 times the savings rate of the young.