下面偏度系数的值表明数据分布形态是左偏的是（ ） A: 1.429 B: -3.146 C: -3.412 D: 1.426

下面偏度系数的值表明数据分布形态是左偏的是（ ）。 A: 1.429 B: -0.28 C: -3.412 D: -1.01

下面偏度系数的值表明数据分布形态是正态分布的是（ ） A: 1.429 B: 0 C: -3.412 D: 1

下面偏度系数的值表明数据分布形态是左偏的是（ ） A: 1.429 B: 0 C: -3.412 D: 1

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下列变量组（）是一个闭回路。 A: {x，x，x，x，x，x} B: {x，x，x，x，x} C: {x，x，x，x，x，x} D: {x，x，x，x，x，x}

以下谓词蕴含式正确的是（）: (∀x) (A(x)→B(x))=>( ∀x)A(x)→(∀x)B(x)|(∀x) (A(x)↔B(x))=>( ∀x)A(x)↔(∀x)B(x)|(∀x)A(x)∨(∀x)B(x)=>( ∀x) (A(x)∨B(x))|(∃x) (A(x)∧B(x))=>(∃x)A(x)∧(∃x)B(x)

以下谓词蕴含式正确的是（）: (?x) (A(x)→B(x))=>( ?x)A(x)→(?x)B(x)|(?x) (A(x)?B(x))=>( ?x)A(x)?(?x)B(x)|(?x)A(x)∨(?x)B(x)=>( ?x) (A(x)∨B(x))|(?x) (A(x)∧B(x))=>(?x)A(x)∧(?x)B(x)