题目
A line chart with two variables—for example, revenues and earnings per share—is best suited for visualizing:
选项
A.the joint variation in the variables.
B.underlying trends in the variables over time.
C.the degree of correlation between the variables.
答案
B
解析
B is correct. An important benefit of a line chart is that it facilitates showing changes in the data and underlying trends in a clear and concise way. Often a line chart is used to display the changes in data series over time. A is incorrect because a scatter plot, not a line chart, is used to visualize the joint variation in two numerical variables. C is incorrect because a heat map, not a line chart, is used to visualize the values of joint frequencies among categorical variables. 折线图的一个重要优点是，它有助于以清晰简洁的方式显示数据的变化和基本趋势。通常使用折线图来显示数据序列随时间的变化。A是不正确的，散点图用于显示两个数值变量的联合变化。C是不正确的，热力图用于反映可视化分类变量之间的联合频率值。