Statistics Review

The heights in inches of each member of the four groups of a choir are represented in the box plots. Which group has the median with the greatest value?

• Soprano Group

• Alto Group

• Tenor Group

• Bass Group

The box-and-whisker plot shown below represents the number of magazine subscriptions sold by members of a club. Which statistical measures do points B, D, and E represent, respectively?

• lower extreme, median, upper extreme

• lower quartile, median, upper quartile

• lower quartile, upper quartile, upper extreme

• median, upper quartile, upper extreme

Which statement is best supported by the data in the box plots?

• The median of the data for the university is greater than the median of the data for the community college.

• The range of the data for the university is greater than the range of the data for the community college.

• The interquartile range of the data for the community college is greater than the interquartile range of the data for the university.

• The upper quartile for the data for the community college is greater than the upper quartile of the data for the university.

Mrs. Mason made a box plot of the quiz grades in her science class. Three students took the test late and scored 68, 72, and 75. What effect does this have on the box plot?

• The lower extreme decreased.

• The median decreased.

• The median increased.

• The range increased.

Which statement is best supported by the data in the box plot?

• Approximately 25% of the finishing times were in the interval 20 - 22 minutes.

• Approximately 75% of the finishing times were in the interval 15 - 30 minutes.

• Approximately 50% of the finishing times were less than 25 minutes.

• Approximately 25% of the finishing times were greater than 28 minutes.

Which statement best describes why the graph is misleading to someone analyzing sales over time?

• The quarters should be in order by quarter, from left to right.

• The dollar scale should start at 80 to emphasize the differences in quarters.

• The width of the bars makes sales appear smaller than they actually are.

• The scale for sales makes the sales appear greater than they actually are.

If Johnathan wanted to conduct an experiment and then create a box plot based on what he saw, which question could he use while collecting, organizing, and analyzing the data?

• Are female students taller than male students?

• Do male students wear larger shoes than female students?

• Can a bounce house be inflated faster than it can be deflated?

• Do taller female students bounce higher than shorter male students.

Amanda wants to know if more 7th grade students prefer chocolate ice cream than 6th grade students. Which of the following could Amanda NOT use to collect data for her box plots?

• Observations

• Surveys

• Measurements

• Experiment

A computer science teacher wants to know how students at a school most often access the Internet. The teacher surveys students in one of his computer science classes and used the data to create box plots. Which of the following is true about the data collected?

• The sample is biased because other students in the school did not have an opportunity to be chosen.

• The sample is unbiased because other students in the school did not have an opportunity to be chosen.

• The sample is biased because one class represents the larger population.

• The sample is unbiased because one class represents the larger population.

Which statement best represents the relationship in the scatterplot?

• A. As the children's weight increased, their height stayed the same.

• B. As the children's weight increased, their height increased.

• C. As the children's weight increased, their height decreased.

• D. As the children's weight decreased, their height increased.