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【简答题】
第二章课后习题1,具体见书本(注:书上的参考答案有误)。可以在纸上写了拍照后直接以图片上传,不要选上传附件,附件打开特别慢。
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
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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