期末复习试卷A
吉林师范成人教育《微观经济学A》期末考试复习题及参考答案
吉林师范成人教育考试试卷
《微观经济学》试卷A 年级专业姓名分数
一、名词解释（6*5，共30分）
1.、机会成本
2、吉芬商品
3、需求定理
4、边际效用递减规律
5、公共物品
二、单项选择题（2*6，共12分）
1．研究个别居民户与厂商决策的经济学称为（）。
A.宏观经济学
B.微观经济学
C.实证经济学
D.规范经济学
2.下列事物中不具备稀缺性的是（）。
A. 空气
B.矿泉水
C.食物
D.安全保卫
3. 咖啡和茶叶可相互替代，当咖啡的价格急剧上升时，对茶叶的需求量将（）。
A.减少
B.保持不变
C.增加
D.以上三种情况均有可能发生
4. 生产者预期某物品未来价格要下降，则对该物品当前的供给会（）。
A.增加
B.减少
C.不变
D.上述三种情况都可能
5.无差异曲线的形状取决于（）。
A.消费者偏好
B.消费者收入
C. 所购商品的价格
D.商品效用水平的大小
6.某人的吸烟行为属于（）。
A.生产的外部经济
B.消费的外部经济
C.生产的外部不经济
D. 消费的外部不经济
三、计算（10*1，共10分）
1. 2000年7月某外国城市公共汽车票价从32美分提高到40美分，2000年8月的乘客为由去年同期的1000万人次减少到880万人次，求需求的弧价格弹性。
四、判断说明题（10*1，共10分）
1. 某商品的需求价格弹性估计为1.6，如果你是一个企业管理者，为了增加销售收入，价格应该提高还是应该降低，请给出你的选择并说明理由。
Visual Basic程序设计期末复习试题(A)含答案
（1）编写一个子过程，计算1×2+2×3+……+（n-1）×n的值。
（2）输入n的值，将计算结果显示在窗体上。
VB课程试卷（A）卷第1页共3页
题号
一
二
三
四
五
六
七
八
九
十
总分
说明:本课程考试分为上机考试和笔试两部分,满分100分,其中上机占40分,笔试60分,本试卷为笔试试卷，卷面满分60分。
3.执行语句s = len(mid(“VisualBasic”,1,6))后，s的值是(C)。
(A) Visual (B) Basic (C) 6 (D) 11
4.下列选项中，合法的变量名(B)。
(A) c%aaa (B) sum__3 (C) Else (D) 5persons
6.返回系统当前日期和时间的函数是(D)。
(A) Time()(B) Day() (C) Date()(D) Now()
6.运行以下程序后，x的值是(B)。
x=2
fori= 1 to 10 step 2
x = x +i
nexti
(A) 25(B) 27 (C) 38(D) 57
7.要让一个控件不显示，应将该控件的（D）属性设置成False。
Print x , y
14.下列程序的结果是________________。
For i = 1 to 4
X = 4
For j = 1 to 3
X = 3
For r =1 to 5
X = X + i
Next r
人教部编版五年级语文下册期末专项复习字义字形部分试卷A(含答案)
1.给加点词选择正确的解释。
（1）童孙未解供．耕织( ) A.提供 B.供应 C.从事（2）青春．．作伴好还乡( ) A.春天 B.人生好时节 C.青少年（3）一个个序齿．．排班( ) A.按年龄大小排序 B.按身份高低排序2.请你给下面的形近字组词，并填入括号里。
燥噪（1）房屋里的空气非常（______），需要种上几盆花来湿润一下空气。
（2）为了减少（_______）的侵扰，我们要多种树。
3.为横线字选择正确的字义。
支援（______）①引，牵；②帮助、救助；③引用。
定罪（______）①犯罪的行为；②刑法；③苦难、痛苦虚实（______）①空；②不真实的；③衰弱。
4.下列词语中共有6个错别字，请圈出来并将正确的字写在横线上。
①繁华似棉姹紫嫣红抓耳挠腮杯水车薪 ________②安居乐业鞠躬尽粹赴汤蹈火心极如焚 ________③铤而走险巧舌如簧应接不瑕故伎重演 ________④连声屏气自强不熄奄奄一息大饱眼福 ________5.用“雅”字组成不同的词填空。
①杏花村山清水秀，环境清幽_______，民风古朴，是休闲度假的好去处。
②妈妈说钢琴是_______艺术，希望我用心学习。
③语文课上，小光坐的姿势很不_______，老师用目光示意他坐端正。
6.选字填空。
呀吗吧呢（1）你吃饭了（____）？（2）下雨了，你快回家（____）！（3）今天，你怎么有空出来（___）？（4）妈妈正忙着做饭（____）！7.给加点的字词选择正确的解释。
（1）童孙未解．供耕织。
( )A．准备。
B．从事。
C．奉献。
（2）草满池塘水满陂．。
( )A．山坡。
B.池塘。
C.池岸。
（3）稚子．．金盆脱晓冰。
( )A．幼稚的孩子。
B．幼小的孩子。
C．顽皮的孩子。
（4）稚子金盆脱．晓冰。
( )A．脱落B取下C脱离D.逃离8.下列词语中有错别字的一组是（）。
A. 萌动澄澈平沙无垠B. 冷艳幽芳美妙绝伦C. 蒙胧眷念碧波万倾D. 玷污欺凌顶天立地9.给下列多义字（好）选择正确的解释，将正确答案的序号写在括号里。
统计学复习试题与答案(1) 2
泉州师院2010—2011学年度第二学期本科2008级《统计学》期末复习试卷A一、判断题（对的打“√”；错的打“×”，并在原题上改正。
每小题2分，共10分）1．众数是总体中出现最多的次数。
（ ）2．相关系数为零，说明两现象之间毫无关系。
（ ）3．方差分析是为了推断多个总体的方差是否相等而进行的假设检验。
（ ）4．对总体参数提出某种假设，然后利用样本信息判断假设是否成立的过程称为参数估计。
（ ）5．统计表的总标题位于表的上端，统计图的总标题也是位于图的上端（ ）二、单项选择题 （每小题1分，共10分）1．某森林公园的一项研究试图确定哪些因素有利于成年松树长到60英尺以上的高度。
经估计，森林公园长着25000棵成年松树，该研究需要从中随机抽取250棵成年松树并丈量它们的高度后进行分析。
该研究的总体是（ B ）A. 250棵成年松树B.公园里25000棵成年松树C.所有高于60英尺的成年松树D.森林公园中所有年龄的松树2．从均值为100、标准差为10的总体中，抽出一个50 n 的简单随机样本，样本均值的数学期望和方差分别为（ A ）A. 100和2B. 100和0.2C. 10和1.4D. 10和23．若两个变量的平均水平接近，标准差越大的变量，其（ B ）A ．标准差代表性越大B ．离散程度越大C ．稳定性越高D ．分布偏斜程度越严重4．某电视台就“你最喜欢的电视节目是哪个”随机询问了200名观众，为了度量调查数据的集中趋势，需要运用的指标是（ D ）A ．算术平均数B ．几何平均数C ．中位数D ．众数5．将抽样单位按某种特征或某种规则划分为不同的层，然后从不同的层中独立、随机地抽取样本，这种抽样方式称为( B )A.简单随机抽样B.分层抽样C.整群抽样D.系统抽样6．对总体均值进行区间估计时，其他条件不变，置信度1-α 越小，则（ D ）A ．抽样推断的准确度越低B ．抽样推断的把握程度越高C ．抽样推断的可靠程度越大D ．允许误差范围越小7．点估计的缺点是（ C ）A.不能给出总体参数的准确估计B.不能给出总体参数的有效估计C.不能给出点估计值与总体参数真实值接近程度的度量D.不能给出总体参数的准确区间8．假设检验中，拒绝域的大小与我们事先选定的（ D ）A．统计量有一定关系 B．临界值有一定关系C．置信水平有一定关系 D．显著性水平有一定关系9．假设检验是对未知总体某个特征提出某种假设，而验证假设是否成立的资料是（A ）A．样本资料 B.总体全部资料C. 重点资料D.典型资料10．下面现象间的关系属于相关关系的是（C ）A.圆的周长和它的半径之间的关系B.价格不变条件下,商品销售额与销售量之间的关系C.家庭收入愈多,其消费支出也有增长的趋势D.正方形面积和它的边长之间的关系三、多项选择题（每小题2分，共10分）1．“统计”一词有三种理解（）A. 统计工作B. 统计资料C. 统计信息D. 统计科学2．根据某样本资料得居民平均收入（万元）与某种产品销售量（台）之间的回归方程为xy6820ˆ+=，这意味着（）A．居民平均收入与某种产品销售量之间是负相关B．居民平均收入与某种产品销售量之间是正相关C．居民平均收入为1万元时，某种产品的销售量平均为826台D．居民平均收入每增加1万元，某种产品销售量平均增加6台E．居民平均收入每增加1万元，某种产品销售量平均减少6台3．在参数估计中，评价估计量好坏的标准有（）A. 无偏性B. 有效性C. 相合性D. 一致性4．假设检验中所犯错误有两种类型（）A. 取真错误B. 弃真错误C. 取伪错误D. 弃伪错误5．样本单位数取决于下列因素（）A. 被研究总体的标志变异程度B. 抽样极限误差C. 抽样调查组织方式和抽样方法D. 研究的代价四、填空题（每空1分，共10分）1.在实际试验中，许多不能控制的偶然因素引起试验结果数值的差异，称为＿＿＿＿＿＿误差。
数据结构期末复习题A6
8．若采用邻接矩阵来存储简单有向图，则其某一个顶点i的入度等该矩阵（）。
Array A．第i行中值为1的元素个数B．所有值为1的元素总数C．第i行及第i列中值为1的元素总个数D．第i列中值为1的元素个数9．在一个无向图中，所有顶点的度数之和等于所有边数的____倍。
A. 1/2B. 1C. 2D. 410.采用顺序查找方法查找长度为n的线性表时，每个元素的平均查找长度为____.A. nB. n/2C. (n+1)/2D. (n-1)/211. 对于给定的一组关键字（12，2，16，30，8，28，4，10，20，6，18），按照下列二路归并排序算法进行递增排序，第一趟排序后得到的结果是（）。
A．2，12，16，8，28，30，4，6，10，18，20B．2，12，16，30，8，28，4，10，20，6，18C．12，2，16，8，28，30，4，6，10，28，18D．12，2，10，20，6，18，4，16，30，8，2812. 在理想情况下，散列表中查找元素所需的比较次数为（）。
A．n B．O C．n／2 D．113. 排序方法中，从未排序序列中依次取出元素与已排序序列（初始时为空）中的元素进行比较，将其放入已排序序列的正确位置上的方法，称为____。
A. 希尔排序B. 起泡排序C. 插入排序D. 选择排序二、填空:（每空1分, 共10分）1.设线性表中元素的类型是实型，其首地址为1024，则线性表中第6个元素的存储位置是。
2. 对于顺序存储的栈，因为栈的空间是有限的，在进行运算时，可能发生栈的上溢，在进行运算时，可能发生栈的下溢。
3. 在双向链表中，每个结点有两个指针域，一个指向____ __，另一个指向___ __。
4.由一棵二叉树的前序序列和可唯一确定这棵二叉树。
5．折半查找的存储结构仅限于___ _，且是_ ___。
6．对于一个具有n个顶点和e条边的连通图，其生成树中的顶点数和边数分别为和。
运筹学期末复习题
《运筹学》期末考试试卷(A)学院班级学号一、填空题以下是关于目标函数求最大值的单纯行表的一些结论，请根据所表述的意思判断解的情况：1.所有的检验数非正，这时的解是。
2.有一个正检验数所对应的列系数均非正，这时线性规划的解。
3.非基变量检验数中有一个为零时，线性规划的解。
4.在两阶段法中，如果第一阶段的最优表中的基变量中有人工变量，则该线性规划。
6.基变量取值为负时的解为。
7.最优表中的非基变量检验数的相反数就是。
8.已知一个线性规划两个最优解是：（3，2），和（5，9），请写出其他解：9.线性规划的解有唯一最优解、无穷多最优解、无界解和无可行解四种。
10.在求运费最少的调度运输问题中，如果某一非基变量的检验数为4，则说明如果在该空格中增加一个运量运费将增加4。
11.“如果线性规划的原问题存在可行解，则其对偶问题一定存在可行解”，这句话对还是错？ 错 12.如果某一整数规划：MaxZ=X 1+X 2X 1+9/14X 2≤51/14 -2X 1+X 2≤1/3 X 1,X 2≥0且均为整数所对应的线性规划（松弛问题）的最优解为X 1=3/2，X 2=10/3，MaxZ=6/29，我们现在要对X 1进行分枝，应该分为 X1≤1 和 X1≥2 。
13.在用逆向解法求动态规划时，f k (s k )的含义是： 从第k 个阶段到第n 个阶段的最优解。
14. 假设某线性规划的可行解的集合为D ，而其所对应的整数规划的可行解集合为B ，那么D 和B 的关系为 D 包含 B15. 已知下表是制订生产计划问题的一LP 最优单纯形表（极大化问题，约束条件均为“≤”型不等式）其中X3,X4,X5为松驰变量。
问：（1）写出B -1=⎪⎪⎪⎭⎫ ⎝⎛---1003/20.3/1312(2)对偶问题的最优解：Y ＝（5，0，23，0，0）T16. 线性规划问题如果有无穷多最优解，则单纯形计算表的终表中必然有___某一个非基变量的检验数为0______；17. 极大化的线性规划问题为无界解时，则对偶问题_ 无解_____；18. 若整数规划的松驰问题的最优解不符合整数要求，假设X i =b i 不符合整数要求，INT （b i ）是不超过b i 的最大整数，则构造两个约束条件：Xi ≥INT （b i ）＋1和 Xi ≤INT （b i ），分别将其并入上述松驰问题中，形成两个分支，即两个后继问题。
跨境电商英语(A卷)期末考试卷模拟试卷带答案测试卷练习题复习题
《跨境电商英语》期末试卷（A）Part 1. Useful Expressions （共15 小题,每小题1 分，合计15 分）Directions: The following is a list of terms related to Cross-border E-commerce. After reading it, you are required to write the corresponding English expression.1.预期利润2.企业文化3.营销活动 4 .社交媒体5.店铺描述6.关键词7.批发价8.数据分析9.属性词10.目标客户11 .物流12 .客户服务13.流量词14.品牌风格15 .交易额Part 2. Translation （共6小题,16-20题每小题3分,21题10分,合计25分）Directions: This part, numbered 11 to 15, is to test your ability to translate Chinese into English of the five sentences. No.16 is to test your translation ability of paragraph from English into Chinese.16.产业园区的建设对城市的可持续发展起到了至关重要的作用。
17.如果遇到困难，请尽管与我们的客户服务部联系。
18.平台已同意对此纠纷进行调查。
19.中国跨境电商可能在未来几年保持高速增长。
20.顾客如不满意可以全额退货。
21.First of all, the selected products should be suitable for air express delivery. These products should basically meet the following requirements: relatively small size and suitability to be delivered by express to reduce the cost of international logistics;high added value is required to be suitable to be packed for sale, and if the value of product is less than shipping then it is not the case; uniqueness: products need to be unique in order to continuously stimulate buyers to purchase and have high online transactions volume; reasonable price: if online prices are higher than local market prices, they may fail to attract buyers to order online.Part 3. Reading Comprehension (共15 小题，每小题2 分，合计30 分) Directions: Read the following passages. After reading them, you should decide whether each statement is true (T) or false (F).Passage 1, launched in 2014 as a cross-border B2B e-commerce platform, is built to facilitate small and medium sized Chinese enterprises. Average order size remains small for this reason. The variety of items listed, however, is not affected by the size of the businesses, and categories of products include clothes, bags, shoes, sports items, toys, jewelry, electronics, mobile phones, musical instruments, car parts, video games and many more. Europe, America and Australia are its major markets, and currently it owns 1.2 million domestic suppliers, 5.5 million buyers and 25 million kinds of products. The website does not charge a membership fee from either buyer or seller. Instead, it charges only a commission as a percentage of successful transaction amounts. This percentage ranges from 3 percent to 10 percent. Though the website remains free for sellers, a special value-added service called DHfactory has recently been added. Sellers can pay an annual fee to avail this service. The company is set to launch further exclusive services to complete better in the Chinese online wholesale market. Buyers and sellers are required to interact through the website. There is an escrow payment service that protects buyers and a customer service department to help solve disputes. is a transaction platform providing transaction services for both buyers and sellers in order to promote online trading. Based on the positioning, DHgate's profit consists of two parts:® commission: serves as a transaction platform for buyers and sellers and charges the buyers a certain amount of commission for successful transactions, and ② service fee: since cross-border e-commerce is operated by users in more than 200 countries and one hundred thousand cities around the world, it is much more complicated than domestic e-commerce. Also, the whole transaction process of cross-border e-commerce takes more time, and buyers and sellers call for services of higher standards. The complicated and commercial features of these transactions determine that multiple services are needed in the whole cross-border transaction process. Given the characteristics, DHgate provides services like intensive logistics, financial service and agency service for some fees.Transaction commission: It is free to register, uphold product information and display them on . The buyer will only be charged commission based on the transaction volume for a successful transaction.Commission model: DHgate adopts the single commission rate model, which means that a fixed proportion of commission is charged according to the category. This model works with a multiple commission policy---when a single order is worth no less than USD 300, the commission rate is 4.5%.Service object: It expands from small and medium merchants to large foreign trade companies, manufacturers and brand owners.Platform expansion: Besides transaction platform, DHgate launched online cargo center for traditional foreign trade companies. In August 2013, DHgate launched a “global online cargo center" by cooperating with the merchants in Yiwu.Payment: DHpay has access to more than 30 payment means in the world. Logistics: online delivery, warehousing and concentrated freight services. The DHlink supports more than 20 logistics channels including EMS, UPS, DHL, etc. Credit: DHCredit cooperates with financial institutions to provide credit service. 22.The website does not charge a membership fee from either buyer or seller.()23.When a single order is worth no less than USD 3000, the commission rate is4.5%.( )24.The service objects expand from small and medium merchants to large foreigntrade companies, manufacturers and brand owners.( )25.DHgate is a third-party B2C cross-border transaction platform, committing tohelping Chinese SMEs to enter global market through cross-border e-commerce platform.( )26.The DHlink doesn't support logistics channels as EMS, UPS, DHL, etc.( )Passage 2There are many factors that affect the sales of the store. One of those which can not be ignored must be product selecting. A shop with the intention of having higher flow, more exposure and more orders than others must not ignore the selection of goods. It can be said that product selecting is the basis of shop operations, and the first step to make a profit. Product selecting refers to selecting product which meets the demand of the target market from the supply market. Personnel in charge of product selecting must identify the needs of users and, on the other hand, select products with quality, price and appearance in line with the needs of the target market from many supplies in the market. The organic combination of suppliers,customers, personnel in charge of product selecting should be considered for the success of the product selecting.There is a variety of businesses in the current cross-border e-commerce platforms such as beauty, sports and entertainment, baby supplies, toys, shoes, clothing, etc. Of these businesses, some, called business of “red sea", are fiercely competitive, such as jewelry industry, wedding, wig industry, etc. Others, called business of “blue sea", are less competitive, but full of demands from buyers or now to be explored. Businesses of "red sea” are those with hotter competition, more sellers, more orders, larger investment, and lower profit, while business of " blue sea" are those with less competition, fewer orders, smaller investment, but higher profit. It is wise of a freshman, who is short of hum an resources and finance supports, to do businesses of “blue sea” rather than those of “red sea”，more competitive but less profitable.Sellers differ with criteria for what kind of seller is small or medium-sized, because now there is no clear judgment. However, the seller should have a clear self-positioning while running his own online store.For correct market positioning, it is necessary to conduct market research which is concerned about the overall price level of the target market, the price level of the industry, the consumers9 preferences and so on.What has to be further conducted for a good market positioning is to analyze the competitive environment of the product, to do the segmentation of the market, and to test and adjust the market positioning through practice.Website positioning refers to the target market or consumer groups of the website. Product manager, through the understanding of the whole website positioning, has to analyze the categories of website in order to select the appropriate target products which meet the demands of customers.27.Product selecting is one of the factors that affect the sales of the store.( )28.If you have less finance support, you are advised to do business of "red sea”. ()29.Product selecting should focus on many factors except product's size and weight. ( )30.For correct market positioning, it is necessary to conduct domestic marketresearch, but it is not necessary to study foreign markets.( )31.Website poisoning refers to the target market or consumer groups of the website.( )Passage 3Consumption habit is the preference of consumer for a certain kind of commodity, brand or consuming behavior. In nature, it is a stable individual consuming behavior, formed gradually in the long term, and in turn influences consuming behavior. People in the United States attach more importance to the quality of commodity. Quality is vital for commodity to enter the US market, where the commodity with even a slight flaw will be put in the corner and sold in discount. Packaging is another important factor. Commodity should be both in good quality and in fine-decorated packaging to present impressive visual experience to customers.People in the United States highly value the efficiency, thinking wasting time as wasting life. They hope to receive satisfied goods soon after placing orders. Therefore, when setting shipping templates, it is advisable to set highly efficient logistic mode such as UPS, DHL, TNT and FedEx.Because of the United States' large territory and its four time zones, buyers from different time zones shop online at different times. To raise the attention to thelaunched commodities, sellers should sum up experiences, choose and launch products in a time period when online purchasing occurs in high density.January is the high season for apparel sales, with winter clothes sold in discount in the United States. February 14th is the Valentine's Day in this country, making horticultural products, fashion accessories, jewelry, watches, bags and gifts become hot sellers. Spring in America begins in March, which is the high season for horticultural products because of Easter in March.Horticultural products enjoy good sales volume in April in the US market. Sales for women's shoes grow drastically due to the demand of wedding. In this ideal season for wedding, bridesmaids grown and wedding supplies are hot. Mother's Day is on the second Sunday of May. With this day's coming, fashion accessories, jewelry, bags and greeting cards become popular items. Fathers' Day is on the third Sunday of June, where in June also comes the graduation season. Therefore refrigeration appliances, mobile phones and other electronic products are also in their high season this month.The United States' Independence Day is on July 4th. August sees students back to school, making this month a high season for clothing and shoes. Autumn comes in September, and it is the best selling season for apparel. Cosmetics are also in hot sales thanks to the autumn new products' arrival.Halloween is on October 31st. Thanksgiving Day is on the fourth Thursday of November. With some major festivals5 arrival in winter, cosmetics, stuffed toys, and gifts come into high season for sales. Sales volume of fashion accessories, jewelry and watches in December occupies a quarter of the whole year.Approximately 37% of cross-border online buyers throughout the whole world are in Canada. But because of its vast territory and thin population, logistics is quite achallenge for remote areas in this country. Fortunately, 80% of Canada's populations live in the areas less than 60 miles from the US borders, namely three major cities of Canada. Canada is a major market for the US Cross-border E-commerce, for its precise delivery time, and more preferable taxation rate than that in the United States.60% of Canadians purchase online from America. 38% of Canada's populations live in Ontario, where the relatively low logistic fees and exchange rates fuel the Canadian's online shopping behavior. In Canada, credit cards9penetration rate is high. 81% of online payment is made by credit cards, followed by PayPal (42%). These factors promote the cross-border finance.Canadians are passionate about sports. 54% of Canada's populations regularly take part in sports activities. As a result, there is a large demand for sports equipments and facilities. The top five favored sports in Canada are golf, ice hockey, baseball, swimming and basketball. As a part of many Canadians' life, sports give Canada huge sports products consumption ability, with large demand for sports products. The five major sports products in Canada are gym shoes, sportswear, bicycles and accessories, golf equipments, and training devices. The retail volumes of these five products show an increasing trend. Among them, two traditional sports products, gym shoes and sportswear occupy half of the sports equipments market in Canada. China has strength and potential in exporting sportswear and gym shoes. Therefore, Chinese firms who wish to explore and expand overseas market are suggested to pay more attention to business opportunities in Canadian market, especially in sportswear and gym shoes market.32.Quality, packaging and logistics efficiency are factors that American peopleattach more importance to when they purchase online.( )33.Refrigeration appliances, mobile phones and other electronic products arepopular items in May.( )34.Sales volume of fashion accessories, jewelry and watches in December occupies50% of the whole year.( )35.Logistics is quite a challenge for remote areas in Canada.( )36.There is a large demand for sports equipments and facilities in Canada sinceCanadians work out regularly.( )Part 4. Writing (共3小题,37.39题每小题10分,合计30分)Directions: This part is to test your ability to do practical writing. Suppose you were a customer service representative. Now you are required to write reply letters to your customers according to the following information.37.38.39.《跨境电商英语》期末试卷（A）每小题1分，合计15分） 2. corporate culture4. social media 6. keyword 8. data analysis 10. target customer 12.customer service 14. brand stylePart 2. Translation （共6小题,16-20题每小题3分,21题10分,合计25分）16. The construction of industrial parks plays a crucial role in city's sustainable development.17. In the event of difficulties, please do not hesitate to contact our Customer Service Department.18. The platform has given its approval for an investigation into the dispute.19. China's Cross-border E-commerce will be likely to maintain rapid growth in the next few years.20. Dissatisfied customers can return the product for a full refund.21. 首先就要有适宜通过并且适合通过航空快递运输的商品。
统计学复习试题与答案
泉州师院2010—2011学年度第二学期本科2008级《统计学》期末复习试卷A一、判断题（对的打“√”；错的打“×”，并在原题上改正。
每小题2分，共10分）1．众数是总体中出现最多的次数。
（ ）2．相关系数为零，说明两现象之间毫无关系。
（ ）3．方差分析是为了推断多个总体的方差是否相等而进行的假设检验。
（ ）4．对总体参数提出某种假设，然后利用样本信息判断假设是否成立的过程称为参数估计。
（ ）5．统计表的总标题位于表的上端，统计图的总标题也是位于图的上端（ ）二、单项选择题 （每小题1分，共10分）1．某森林公园的一项研究试图确定哪些因素有利于成年松树长到60英尺以上的高度。
经估计，森林公园长着25000棵成年松树，该研究需要从中随机抽取250棵成年松树并丈量它们的高度后进行分析。
该研究的总体是（ ）A. 250棵成年松树B.公园里25000棵成年松树C.所有高于60英尺的成年松树D.森林公园中所有年龄的松树2．从均值为100、标准差为10的总体中，抽出一个50 n 的简单随机样本，样本均值的数学期望和方差分别为（ ）A. 100和2B. 100和0.2C. 10和1.4D. 10和23．若两个变量的平均水平接近，标准差越大的变量，其（ ）A ．标准差代表性越大B ．离散程度越大C ．稳定性越高D ．分布偏斜程度越严重4．某电视台就“你最喜欢的电视节目是哪个”随机询问了200名观众，为了度量调查数据的集中趋势，需要运用的指标是（ ）A ．算术平均数B ．几何平均数C ．中位数D ．众数5．将抽样单位按某种特征或某种规则划分为不同的层，然后从不同的层中独立、随机地抽取样本，这种抽样方式称为( )A.简单随机抽样B.分层抽样C.整群抽样D.系统抽样6．对总体均值进行区间估计时，其他条件不变，置信度1-α 越小，则（ ）A ．抽样推断的准确度越低B ．抽样推断的把握程度越高C ．抽样推断的可靠程度越大D ．允许误差范围越小7．点估计的缺点是（ ）A.不能给出总体参数的准确估计B.不能给出总体参数的有效估计C.不能给出点估计值与总体参数真实值接近程度的度量D.不能给出总体参数的准确区间8．假设检验中，拒绝域的大小与我们事先选定的（）A．统计量有一定关系 B．临界值有一定关系C．置信水平有一定关系 D．显著性水平有一定关系9．假设检验是对未知总体某个特征提出某种假设，而验证假设是否成立的资料是（）A．样本资料 B.总体全部资料C. 重点资料D.典型资料10．下面现象间的关系属于相关关系的是（）A.圆的周长和它的半径之间的关系B.价格不变条件下,商品销售额与销售量之间的关系C.家庭收入愈多,其消费支出也有增长的趋势D.正方形面积和它的边长之间的关系三、多项选择题（每小题2分，共10分）1．“统计”一词有三种理解（）A. 统计工作B. 统计资料C. 统计信息D. 统计科学2．根据某样本资料得居民平均收入（万元）与某种产品销售量（台）之间的回归方程为xy6820ˆ+=，这意味着（）A．居民平均收入与某种产品销售量之间是负相关B．居民平均收入与某种产品销售量之间是正相关C．居民平均收入为1万元时，某种产品的销售量平均为826台D．居民平均收入每增加1万元，某种产品销售量平均增加6台E．居民平均收入每增加1万元，某种产品销售量平均减少6台3．在参数估计中，评价估计量好坏的标准有（）A. 无偏性B. 有效性C. 相合性D. 一致性4．假设检验中所犯错误有两种类型（）A. 取真错误B. 弃真错误C. 取伪错误D. 弃伪错误5．样本单位数取决于下列因素（）A. 被研究总体的标志变异程度B. 抽样极限误差C. 抽样调查组织方式和抽样方法D. 研究的代价四、填空题（每空1分，共10分）1.在实际试验中，许多不能控制的偶然因素引起试验结果数值的差异，称为＿＿＿＿＿＿误差。
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命题人或命题小组负责人签名： 教研室（系）主任签名： 分院（部）领导签名：
嘉兴学院试卷
2008—2009学年第一学期期末考试试卷NO 卷
课程名称： 概率论与数理统计 使用班级：经管类本科 考试形式： 闭卷
一、填空题 (每小题2分，共10分)
1、一射手对同一个目标独立地进行4次射击，若至少命中一次的概率为81
80
，则该射手的命中率为 .
2、 设随机变量X 在区间[2,5]上服从均匀分布，则=)(2X E ________ .
3、 设X 服从参数为10=θ的指数分布，Y )2,3(~2
N ，且X 与Y 相互独立，Y X Z 23-=，
则=)(Z D ______.
4、已知5.0,9)(,4)(===XY Y D X D ρ，则=+)(Y X D .
5、设总体),(~2
σμN X ,n X X X ,,,21 为来自X 的简单随机样本,则
~11
∑==n
i i X n X .
二、单项选择题 (每小题2分，共10分)
1．对于任意两事件A 和B ，=-)(B A P .
（A ）)()(B P A P - （B ）)()()(AB P B P A P +- （C ） )()(AB P A P - （D ）)()()(B A P A P A P -+ 2、.对于任意两个随机变量，若)()()(Y E X E XY E =则____ _____.
(A))()()(Y D X D XY D = (B))()()(Y D X D Y X D +=+ (C) X 与Y 相互独立 (D)X 与Y 相互不独立
3、设Y X ,相互独立，X 和Y 的分布律分别为
，则必有 .
（A ）Y X = （B ）{}0==Y X P （C ）{}1==Y X P （D ）{}58.0==Y X P
4、 在假设检验中,原假设0H ,备择假设1H ,则称________ 为犯第二类错误 (A)10H H 为真，接受 (B) 00H H 不真，拒绝 (C) 10H H 为真，拒绝 (D) 00H H 不真，接受
5、 已知341.1)15(90.0-=t 。
设随机变量X 服从自由度为15的t 分布，若90.0)(=<a X P ，则
=a _____ _____.
(A) -1.341 (B) 1.341 (C) 15 (D) -15
三、计算题 (共
52分)
1、 有四位同学报考硕士研究生，他们被录取的概率分别为0.
2、0.
3、0.45、0.6，
试求至少有一位同学被录取的概率. (5分)
2、 某年级有甲，乙，丙三个班级，其中各班的人数分别占年级总人数的1/ 4, 1/3, 5/12,已知甲,
乙,丙三个班级中是独生子女的人数分别占各班人数的1/ 2, 1/ 4, 1/5, 求:： (1) 从该年级中随机的选一人,该人是独生子女的概率为多少?
(2) 从该年级中随机的选一人,发现其为独生子女,则此人是甲班的概率为多少? （8分）
命题人或命题小组负责人签名： 教研室（系）主任签名： 分院（部）领导签名：
3、设有5件产品,其中有两件次品,今从中连取二次,每次任取一件不放回,以X 表示所取得的次品数,试求: : (1)X 的分布律和分布函数)(x F ; (2)122
+=X Y 的分布律. (9分)
4、 某商品的日销量X (公斤)～)300,10000(2
N , 求:日销量在9700到10300公斤之间的概率. （8413.0)1(=Φ 97725.0)2(=Φ备用） (8分)
5、设随机变量X 的密度函数为⎩⎨
⎧≥=-其它
0)(2x Ce x f x
，
求： (1) 常数C ； (2) 概率}2/11{<<-X P ； (3) )(X E ；
（4）设X Y 2=,则Y 的密度函数)(y f Y 。
（10分）
6、设二维随机变量),(Y X 的分布律为:
求：（1）关于Y X 、的边缘分布律； （2）问Y X 、是否相互独立，并说明理由； （3）)()()()(Y D X D Y E X E 、、、 （4）XY Y X ρ和，)cov( （12分）
命题人或命题小组负责人签名： 教研室（系）主任签名： 分院（部）领导签名：
四、解答题（共28分）
110<<θ，θ为未知参数，n X X X ,,,21 为来自总体X 的样本,求θ的矩估计量 (9分)
2、 从某商店一年来的发票存根中抽取25张，算得平均金额为78.5元，样本标准差为20元，假定发
票金额服从正态分布，试求该商店一年来发票金额的均值和方差的置信水平为α-1的置信区间 （取05.0=α）。
（10分）
3、某糖厂用自动打包机装糖，已知每袋糖的重量（单位：千克）服从正分布)5.2,(2μN ．今随机地抽取9袋，并称出它们的重量921,,,x x x ，由此算得5.48=x ．检验50:0=μH .（取显著性水平
05.0=α） （9分）
附：查表数据
064.2)24(025.0=t 96.1025.0=u 64.105.0=u 401.12)24(2
0975=χ 7.2)9(2
975
.0=χ 364.39)24(2025.0=χ 023.19)9(2025.0=χ。