【考点】Scatterplot散点图
【难度系数】★★★☆☆
【答案评析】考生首先理解题干中关于计算年龄的方法描述：“One method of calculating the approximate age, in years,of a tree of a particular species is to multiply the diameterof the tree, in inches, by a constant called the growth factor for that species.”
即年龄=直径×growth factor
此题给出散点图，横纵坐标分别就是diameter和age，因此要求growth factor，只要估算出scatterplot的斜率即可。大致拟合：
可得斜率slope约为7.5。对应table可知此growth factor对应hagbark hickory.
答案选D
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