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【多选题】
下列关于直线回归的说法中,正确的是
A.
回归分析前应绘制散点图
B.
应变量与自变量关系应为线性
C.
回归方程可用来描述两定量变量间数量依存的关系
D.
直线回归分析时要求两变量均服从正态分布
E.
假设检验的 P 值能够反映自变量对应量数量上的影响大小
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【单选题】以下程序执行后sum的值是() void mian() { int i,sum; for(i=1;i<6;i++) sum+=i; printf("%d\n",sum); }
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