Some AP Statistics questions ask you to compare distributions with stem and leaf plots, distributions with dotplots and distributions with boxplots.
These types of questions are usually easy when compared with other AP exam questions.
Examples of multiple choice questions with distributions of univariate data comparisons:
1. A back to back stem and leaf plot compares the heights of the players of two basketball teams. All heights in the plot below are given in inches.
1 4 4 4 5 8 9
2 3 6 6 6 8 9
1 1 2 4
2 5 6
a) The means of the two distributions are the same. b) The medians of the two distributions are the same. c) The ranges of the two distributions are the same. d) The distributions have the same number of observations. e) None of the statements above is correct.
Team A height mean is 77.5 inches while team B height mean is 76.7 inches, so the a) answer is not correct.
Team A height median is 78 inches while team B height median is 76 inches, so the b) answer is not correct.
Similarly, the ranges and the number of observations of team A vs. team B are not the same, so the e) is the correct answer.