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【判断题】
正态分布有两个参数即均数μ和标准差σ, μ越大, 曲线的形状越离散即‘矮胖’。A.
正确
B.
错误
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反馈参考答案：
举一反三
【简答题】A．Because he has to pick up his wife at home. B．Because he wants to buy something in the supermarket. C．Because he has to work until five. D．Because he wants to have a rest in the afternoon.
【简答题】A．He is going to sign a contract. B．He is signing his check to buy something. C．He wants to skim through the piece. D．He wants to register his name to enroll a course.
【简答题】A．Because he has to pick up his wife at home． B．Because he wants to buy something in the supermarket. C．Because he has to work until five. D．Because he wants to have a rest in the afternoon.
【简答题】If someone wants to buy a travel card season ticket, what should he bring with him?
【单选题】五个样本率作比较，χ2＞χ20.01(4)，则在α=0.05的检验水准下，可认为
A.
各总体率不全等
B.
各总体率均不等
C.
各样本率均不等
D.
各样本率不全等
E.
至少有两个总体率相等
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