【单选题】The scientist knew nothing about the matter, because he was always _________ himself in his study.
【简答题】It happened towards evening, when I was resting in a cafe. I 36 a pair of newly bought white leather shoes, which were rather expensive. Then 37 came to me. He was in an unfit shirt, 38 pale and weak...
【单选题】从2000名学生中按不重复抽样方法抽取100学生进行调查,其中有女生45名,则样本成数的抽样平均误差为( )
【简答题】收到宏达公司前欠货款 100 000元,收到银行收账通知单。(2分)
【单选题】从2000名学生中按不重复抽样的方法抽取了100名进行调查,其中有女生45名,则样本成数的抽样平均误差为
【单选题】从2000名学生中按不重复抽样方法抽取了100名进行调查,其中有女生45名,则样本成数的抽样平均误差为( )。
【简答题】It happened towards evening, when I was resting in a cafe. I a pair of newly bought white leather shoes, which were rather expensive. Then came to me. He was in an unfit shirt, pale and weak. He looke...
【单选题】从2000名学生中按不重复抽样方法抽取了100名进行调查,其中有女生45名,则样本比例的抽样平均误差为
【单选题】从2000名学生中按不重复抽样方法抽取了100名进行调查,其中有女生45名,则样本成数的抽样标准误为
【单选题】When I came in,he was ___his book.