对变量X与Y进行相关分析与回归分析,下列结果中有可能是正确的。
A: y=5+2.1x r=-0.84
B: y=5+2.1x r=1.04
C: y=-5-2.1x r=-0.84
D: y=-5-2.1x r=-1.04
A: y=5+2.1x r=-0.84
B: y=5+2.1x r=1.04
C: y=-5-2.1x r=-0.84
D: y=-5-2.1x r=-1.04
举一反三
- 对变量X与Y进行相关分析与回归分析,下列结果中有可能是正确的。A. y=5+2...D. y=-5-2.1x r=-1.04
- 写出下面程序运行结果。public class Demo public static void main(String args[]) int x = 5, y = 10, r = 5 switch (x y) case 15: r = x case 20: r -= y case 25: r = x / y default: r = r System.out.println(r)
- 从($y)("x)R(x,y)不能推出的是: A: ("x)($y)R(x,y) B: ("y)($x)R(x,y) C: ($x)($y)R(x,y) D: ($y)($x)R(x,y)
- 【单选题】公式(∀x)[P(x)∧Q(x, A) →(∃y)[R(x, y)∨S(y)]]中,∀x的辖域为 , ∃y的辖域为 。 A. P(x); R(x, y) B. P(x)∧Q(x, A); R(x, y) C. P(x)∧Q(x, A)→(∃y)[R(x, y)∨S(y)]; R(x, y) D. P(x)∧Q(x, A)→(∃y)[R(x, y)∨S(y)]; R(x, y)∨S(y)
- 与公式("x)(P(x)∧Q(x, y))Þ($x)R(x, y)等值的是( )。 A: ("x)(P(x)∧Q(x, z))Þ($x)R(x, y) B: ("y)(P(y)∧Q(y, y))Þ($x)R(x, y) C: ("z)(P(z)∧Q(x, y))Þ($x)R(x, y) D: ("u)(P(u)∧Q(u, z))Þ($x)R(x, z)