单选题:回答题Howdoes the man know about electricity? 题目分类:英语六级 题目类型:单选题 查看权限:VIP 题目内容: 回答题Howdoes the man know about electricity? A. He is a professional electricia B. He possesses a basic knowledge of electricit C. He knows nothing about electricit D. Electricity is his majo 参考答案: 答案解析:
设样本x1,x2,…,xn来自正态总体N(μ,σ2),在进行假设检验时,下列哪种情况下,采用统计量( ) 设样本x1,x2,…,xn来自正态总体N(μ,σ2),在进行假设检验时,下列哪种情况下,采用统计量( ) A.μ未知,H0:σ2=σ02 B.μ已知,H0:σ 分类:英语六级 题型:单选题 查看答案