计量资料的假设检验中常用的三种参数检验方法是:(),Z检验和() 。
t检验,f检验
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Passage Four The world population reached 6. 6 billionthis year,upfrom 6 billion in 1999. By 2025, researchers expect nearly 8 billion peoplewill be living on the planet. Ninety-nine per cent of those new inhabitantswill
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