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【简答题】
一名农业专家在四块相同面积的,作施肥量与亩产量依存关系的试验,得到有关数据如下: 根据上表数据: (1)请指出上述两个变量中,哪个是自变量,哪个是因变量; (2)描出散点图; (3)计算相关系数; (4)对计算结果作出解释。
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