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“总数为N=500,样本容量是n=50,求出间隔500÷50=10,于是每隔10个抽取一个样本,连续抽样50次。”这是采用( )
简单随机取样法

分层随机取样法

等距随机取样法

多段随机取样法
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 佳题速递:
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  • 3[阅读题] Shlander is a man from space. He thinks the people and things on the earth are very strange. He is now writing a letter to his friend at home. Here is part of his letter. Read it and answer the questions.Now I am in a strange world. It is very nice. There are many new things here. There are many earth monsters here, too. The earth monsters look very funny. They have just one head, two arms and two legs. They have thin black strings on their heads. Some earth monsters have brown or yellow strings. The earth monsters have a hole in their face. Every day, they put nice things and balls from the trees into the hole. They put water into the hole, too. The earth monsters do not walk very fast. They move from place to pace in tin boxes.At night, the earth monsters like to look at a square window box. This box has very small earth monsters in it.71. Shlander thinks the people and things on the earth are very ______.A. strange                                  B. nice C. different                                 D. beautiful72. Shlander thinks man on the earth is ______.A. a monkey                              B. a earth monster C. a tin box                               D. a strange world73. The earth monster doesn’t have ________.A. heads, arms and legs                     B. brown or yellow strings on its head C. a hole on its face                         D. a swing on its body74. The earth monsters don’t put ______ on their holes.A. nice things                           B. balls  C. fire                                  D. water75. The square window box is ______.A. a car or a bus                           B. a very small earth monsterC. a TV set                                D. a radio 大学英语(I)
  • 确定某一任务对被试是不是新奇的,是微观发生法的( )阶段 幼儿教师职业道德
  • Now that we’ve _ _ _ _ , can we come to a decision? A、 thought over B、 thought of C、 thought through D、 thought about英语(二)
  • 若变量已正确定义,语句“ifa>b)k=0;elsek=1;”和)等价 C语言程序设计
  • 8[填空题] 用热偶测量温度时,其连接导线应该使用()信号与系统