案例2生活用水调查案例

1、作业二a市自来水生活用水总量的调查一、案例背景我国是水资源缺乏的国家，开展水资源调查十分必要。调查中的 重要一项内容是生活用水调查，因此，a市欲进行一项生活用水调查。生活用水内涵非常宽泛，就a市而言，涉及生活用水的用户可 能包括：1.居民户；2第三产业有关企业，主要是餐饮业、宾馆、洗 车行、浴池、游泳馆等。相关信息:1. a市共有居委会122个，住户总数为31990户，调查的内 容包括自来水用水量，家庭人口数，洗衣机数量等；2. 商业性游泳馆、洗车行、和餐馆酒店在工商局有办理营业持照的登记，但也有些小餐馆属无照经营。二、问题讨论1对上述用户进行调查，如何构建抽样框？在构建抽样框的基础上如何抽样

2、?2. 针对居民户调查，假定采用二阶段抽样，即居委会一一住户，又假定多阶抽样设计效应为2,预调查釆用简单随机抽样抽取32户居民，利用预调查信息计算居民户调查的总样本量（相对误差控制在10%）,并讨论样本量在各阶段的分配；3. 假设最终调查了 130户居民，对居民家庭用水总量进行估计，采用什么样的估计方法比较好，进行具体估计，计算置信区间（95%概率度）。三、参考信息通过对32个预调查样木的信息进行处理，计算得到各项指标的数据特征概况, 表1预调査样本的各指标数据分析情况变量指标均值标准差变异系数家庭人口数3.131.2890.41自来水用量15.676.370.41户拥有洗衣机数2.660.8

3、70.33表2预调査用水量与人口数、家庭拥有洗衣机数的相关关系表变量waterpopui at i onwash mach i ne自来水用量10.994*0.333家庭人口数0.994”10.358户拥有洗衣机数0.3330.3581附录1 预调查32个样本单元信息no.districthouse idpopulationwaterwash machine18288522.6328322315.53314113210.03418147421. 5252239421. 3264882315.5375434315.3485682524.23962690210.221063374315. 6211

4、6452715.021265134524.821365539315.221466361315. 121567231315.041667540419.741767754524.631867803210.32196938029.84207026614.922170311420.422271560210.41237235419.83247236329.832575217524.04268265420. 3327843914.52288749419.92299958420.0430113126210.0331116259421.233211711114.81附录2 最终调查样本信息no.distric

5、thouse idpopulationwaterwash machine1819315.822894736.3338161315.0348174525.035820029.936828429.7378328315.0388331314.7398341315.1210836914.8111184229.92121854315.3013185615.02141879314.00151886525.831618121314.621718198315.531818279524.421918284315.322018291526.25212511315.5322252314.92232534315.53

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10、229.93附录3 居委会户数规模信息居委会编号户数规模居委会编号户数规模居委会编号户数规模居委会编号户数规模114232141631313941792153331436496895139313534135657179621141283517866651972215110362216788698131610337174689129913071053810169898100134838539957075910110892964013071722102152102874115272753103891125342169732041041171217243917414410583131984414075270106771443245140761431071661524846155771411081761625147150781411091621722148122791401102931829749100801571112771923550210811511121462017151130821501131502113552100831501141422225453170841501152692320354292851461162