题目
A tree-map is best suited to illustrate:
选项
A.underlying trends over time.
B.joint variations in two variables.
C.value differences of categorical groups.
答案
C
解析
C is correct. A tree-map is a graphical tool used to display and compare categorical data. It consists of a set of colored rectangles to represent distinct groups, and the area of each rectangle is proportional to the value of the corresponding group. A is incorrect because a line chart, not a tree-map, is used to display the change in a data series over time. B is incorrect because a scatter plot, not a tree-map, is used to visualize the joint variation in two numerical variables. 树图是一种用于显示和比较分类数据的图形工具。它由一组表示不同组的彩色矩形组成，每个矩形的面积与相应组的值成比例。A是不正确的，折线图是用来显示数据序列随时间的变化。B是不正确的，散点图用于可视化两个数值变量的联合变化。