A graphical device that highlights the highest and lowest values in a data set, along with a number of other key observations in an ordered array of the data, such as the upper quartile, the middle value (or median) , and the lower quartile, is called:

A) a boxplot
B) a five-number summary
C) a dotplot
D) a stem-and-leaf plot
E) a histogram

Boxplot

A graphical representation of data points that displays the distribution's quartiles, median, and potential outliers.

Five-Number Summary

A concise statistical summary comprising the minimum, first quartile, median, third quartile, and maximum of a data set.

Stem-and-Leaf Plot

A graphical representation of a data set where each data value is split into a "stem" and a "leaf", allowing for easy visualization of data distribution.