文档介绍：第二章统计随机抽样简单随机抽样 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. (抽签法、随机数法) .,以及由此推断结论的可靠性. Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 笑话《买火柴》妈妈叫小明去买火柴,嘱咐小明说: “你要挑一挑, 千万别买受潮的。”小明答应: “知道了。”火柴买回来后,小明高兴地对妈妈说: “妈妈!我买的火柴根根都能着,真是好极了。”妈妈问: “你敢担保没有一根划不着吗? ”小明挺有把握地回答: “不会的,因为我每一根都试过了。” Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 1936 年,美国总统选举前,一份颇有名气的杂志的工作人员做了一次民意测验,调查共和党的兰顿(当时任堪萨斯州州长)和民主党的罗斯福(当时的总统)谁将当选下一届总统。为了了解公众意向,调查者通过电话簿和车辆登记簿的名单给一大批人发了调查表(注意在 1936 年电话和汽车只有少数富人拥有)。通过分析收回的调查表,显示兰顿非常受欢迎,然而实际选举结果正好相反,最后罗斯福在选举中获胜,其数据如下: 候选人预测结果% 选举结果% Roosevelt (罗斯福) 43 62 Landon (兰顿) 57 38 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 思考:食品卫生工作人员要对校园食品店的一批小包装饼干进行卫生达标检验,:将这批小包装饼干放在一个麻袋中搅拌均匀,然后逐个不放回地抽取若干包,? Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 简单随机抽样的含义:一般地,设一个总体有 N个个体, 从中逐个不放回地抽取 n个个体作为样本( n≤N), 如果每次抽取时总体内的各个个体被抽到的机会都相等, 则这种抽样方法叫做简单随机抽样. Evaluation only. Evaluation only. Created with Cli