Statistics Study Guide

Statistics Study Guide

Multiple Choice

Jeffery is a comic writer. He wants to write new comics for children. He wants to write comics that are specific for his readers. He decides to write the comic specifically for one local elementary school. There are five local elementary schools he is considering. Jeffery wants to write the comic for the most people possible. Which is the best question to ask schools to determine which elementary school has the most students?

• How many school buses drop off students every morning at your school?

• How many computers does your school have?

• How many student chairs are in your school?

• How much milk is consumed at your school every year?

Multiple Choice

James wanted to find out which band was most popular among the middle school students. Where should he conduct his survey to get the most unbiased survey?

• in the school cafeteria

• at the next school board meeting

• at a school dance where band A is playing

• at a store where a member of band B is giving autographs

Multiple Choice

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?

• Kate surveys the football team.

• Kate surveys seventh grade students.

• Kate surveys every 4th student entering the school.

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

Multiple Choice

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

Fill in the Blanks

A group of randomly selected students were asked what their favorite type of cookie was. The bar graph shows the results of the survey. There are 532 students at Sumrall Middle.

Based on the graph shown, how many students favorite cookie would be peanut butter?

Multiple Choice

The box plot shows the heights of grade 7 students in two random samples from two different schools. The sample from each school is 30% of the student population.

Based on the box plot, which comparison is true?

• Grade 7 students from School A are typically shorter than grade 7 students from School B because of the difference in the interquartile ranges of grade 7 student heights at the schools.

• Grade 7 students from School A are typically shorter than grade 7 students from School B because of the difference in the medians of grade 7 student heights at the schools.

• Grade 7 students from School A are typically taller than grade 7 students from School B because of the difference in the interquartile ranges of grade 7 student heights at the schools.

• Grade 7 students from School A are typically taller than grade 7 students from School B because of the difference in the medians of grade 7 student heights at the schools.

Multiple Choice

The box plot shows the test scores between Mrs. McIntosh’s first and second period class. Based on the box plot, which comparison is true?

• 1st and 2nd period classes have the same interquartile range.

• The median of 2nd period is about 5 more than the median for 1st period.

• 2nd period students typically score the highest grade in comparison to 1st period students.

• 2nd period’s variability is approximately double 1st period’s variability.

Multiple Choice

The box plots compare the gross earnings, in millions of dollars, of movies during the month of August and November.

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

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

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

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

Multiple Choice

A movie theater kept track of the attendance on Fridays and Saturdays. The results are shown in the box plots below.

• The attendance on Friday and the attendance on Saturday have the same median and interquartile range.

• The attendance on Friday has a greater median and a greater interquartile range than attendance on Saturday.

• The attendance on Friday has a greater interquartile range than attendance on Saturday, but both data sets have the same median.

• The attendance on Friday has a greater median than attendance on Saturday, but both data sets have the same interquartile range.

Multiple Choice

The dot plots show the heights of students on the basketball team and the lacrosse team.

• The mean height on the basketball team is 3 more than the mean height on the lacrosse team.

• The mean height on the basketball team is 5 more than the mean height on the lacrosse team.

• The mean height on the basketball team is 7 more than the mean height on the lacrosse team.

• The mean height on the basketball team is the same as the mean height on the lacrosse team.