某良种培育基地正在培育甲、乙两种小麦新品种,为了进行对照试验,两种小麦各种了15亩,所得亩产数据(单位:kg)如下: 品种甲:368,392,399,400,405,412,415,421,423,423,427,430,434,445,445; 品种乙:374,383,385,386,391,392,395,397,400,401,401,403,406,410,415. (1)画出两组数据的茎叶图; (2)用茎叶图处理现有的数据,有什么优点? (3)根据茎叶图比较甲、乙两种小麦亩产量的极差及标准差. |