案例分析： 泰坦尼克生还者数据
主要使用直方图
可以是count(默认设置)
也可以是比例，使用fill的美学属性
看一看有多少幸存者，有多少遇难者？
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先看看都有写什么变量
男女分布, 看着该船上性别比例？
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船舱分布，看一看每一个等级的船舱分别有多少人
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看一看，不同性别的乘客在不同船舱的分布是否平均？
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生还者特征描述 谁更容易生还，男士，女士？
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谁更容易生还，头等舱的？
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综合上面的信息，是不是头等舱的女士更容易生还？我们来验证一下：
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