15春北航《统计学》在线作业二满分答案

应用数理统计作业二学号：姓名：电话：二〇一四年十二月对NBA球队的聚类分析和判别分析摘要：NBA联盟作为篮球的最高殿堂深受广大球迷的喜爱，联盟的30支球队大家也耳熟能详，本文选取NBA联盟30支球队2013-2014常规赛赛季场均数据。

利用spss软件通过聚类分析对27个地区进行实力类型分类，并利用判断分析对其余3支球队对分类结果进行验证。

可以看出各球队实力类型与赛季实际结果相吻合。

关键词：聚类分析，判别分析，NBA目录1. 引言 (4)2、相关统计基础理论 (5)2.1、聚类分析 (5)2.2，判别分析 (6)3.聚类分析 (7)3.1数据文件 (7)3.2聚类分析过程 (9)3.3 聚类结果分析 (11)4、判别分析 (12)4.1 判别分析过程 (12)4.2判别检验 (17)5、结论 (20)参考文献 (21)致谢 (22)1. 引言1896年，美国第一个篮球组织"全国篮球联盟（简称NBL）"成立，但当时篮球规则还不完善，组织机构也不健全，经过几个赛季后，该组织就名存实亡了。

1946年4月6日，由美国波士顿花园老板沃尔特.阿.布朗发起成立了“美国篮球协会”（简称BAA）。

1949年在布朗的努力下，美国两大篮球组织BAA和NBL合并为“全国篮球协会”（简称NBA）。

NBA季前赛是 NBA各支队伍的热身赛，因为在每个赛季结束后，每支球队在阵容上都有相当大的变化，为了让各队磨合阵容，熟悉各自球队的打法，确定各队新赛季的比赛阵容、同时也能增进队员、教练员之间的沟通，所以在每个赛季开始之前，NBA就举办若干场季前赛，使他们能以比较好的状态投入到漫长的常规赛的比赛当中。

为了扩大NBA在全球的影响，季前赛有约三分之一的球队在美国以外的国家举办。

从总体上看，NBA的赛程安排分为常规赛、季后赛和总决赛。

常规赛采用主客场制，季后赛和总决赛采用七场四胜制的淘汰制。

[31]NBA常规赛从每年的11月的第一个星期二开罗，到次年的4月20日左右结束。

北京航空航天大学2015春《航空英语2》在线作业二满分答案15春北航《航空英语2》在线作业二满分答案北航《航空英语2》在线作业二单选题一、单选题（共 25 道试题，共 100 分。

）1.My grandfather had always taken a ()interest in my work, and I had an equaladmiration for the stories of his time.A.splendidB.weightyC.vagueD.keen-----------------选择：D2. As one of the world’s highest paid models, she had her face () for five milliondollars.A.depositedB.assuredC.measuredD.insured-----------------选择：D3. We have arranged to go to the cinema on Friday, but we can be () and go anotherday.A.reliableB.probableC.feasibleD.flexible-----------------选择：D4. It’s very () of you not to talk aloud while the baby is asleep.A.concernedB.carefulC.considerableD.considerate-----------------选择：D5. Many in the credit industry expect that credit cards will eventually () papermoney for almost every purchase.A.exchangeB.reduceC.replaceD.trade-----------------选择：C6. The chairman was blamed for letting his secretary () too much work last week.A.take toB.take outC.take awayD.take on-----------------选择：D7. () the enormous flow of food from the entire globe, these countries have for manyyears not felt any population pressure.A.Thanks toB.By means ofC.In line withD.With regard to-----------------选择：A8. Louis Herman, at the University of Hawaii, has () a series of new experiments inwhich some animals have learned to understand sentences.A.installedB.equippedC.devisedD.formatted-----------------选择：C9. The little girl was so frightened that she just wouldn’t () her grip on my arm.A.loosenB.removeC.relieveD.dismiss-----------------选择：A10. The university has launched a research center to develop new ways of () bacteriawhich have become resistant to drug treatments.A.regulatingB.haltingC.interruptingbating-----------------选择：D11. I must congratulate you () the excellent design of the new bridge.A.withB.ofC.atD.on-----------------选择：D12. Every culture has developed () for certain kinds of food and drink, and equallystrong negative attitudes toward others.A.preferencesB.expectationsC.fantasiesD.fashions-----------------选择：A13. Last night he saw two dark () enter the building, and then there was theexplosion.A.featuresB.figuresC.sketchesD.images-----------------选择：B14. To speed up the () of letters, the Post Office introduced automatic sorting.A.treatmentB.deliveryC.transmissionD.departure-----------------选择：B15. We don’t know why so many people in that region like to wear dresses of such ()colors.A.lowB.humbledD.dull-----------------选择：D16. A word processor is much better than a typewriter in that it enables you to enterand () your text more easily.A.registerB.editC.proposeD.discharge-----------------选择：B17. John cannot afford to go to university, () going abroad.A.nothing butB.anything butC.not to speak ofD.nothing to speak of-----------------选择：C18. Researchers at the University of Illinois determined that the () of a father canhelp improve a child’s grades.A.involvementB.interactionC.associationmunication-----------------选择：A19. It may be necessary to stop () in the learning process and go back to the difficultpoints in the lessons.A.at a distanceB.at intervalsC.at caseD.at length-----------------选择：B20. Politically these nations tend to be (), with very high birth rates but pooreducation and very low levels of literacy.A.unstableB.reluctantC.rationalD.unsteady-----------------选择：A21. Three university departments have been () $600,000 to develop good practice inteaching and learning.A.promotedB.includedC.securedD.awarded-----------------选择：D22. There has been a collision () a number of cars on the main road to town.posingB.consistingC.involvingD.engaging-----------------选择：C23. Critics believe that the control of television by mass advertising has () thequality of the programs.A.lessenedB.declinedC.affectedD.effected-----------------选择：C24. Mrs. Smith was so () about everything that no servants could please her.A.specificB.specialC.preciseD.particular-----------------选择：D25. It is said in some parts of the world, goats, rather than cows, serve as a vital () ofmilk.A.storageB.sourceC.reserveD.resource-----------------选择：B-END-。

北航《微积分(上)》在线作业二15秋满分答案
单选题判断题
一、单选题（共5 道试题，共30 分。

）
1. 曲线y=x^2+x-2在点(1.5,1.75)处的切线方程为( )
A. 16x-4y-17=0
B. 16x+4y-31=0
C. 2x-8y+11=0
D. 2x+8y-17=0
-----------------选择：A
2. 设f(x)=x(x-1)(x-2)(x-3),则f’(0)=( )
A. -6
B. -2
C. 3
D. -3
-----------------选择：A
3. 一枚硬币前后掷两次所出现可能结果的全部所组成的集合，可表示为
A. {正面，反面}
B. {(正面，正面)、(反面，反面)}
C. {(正面，反面)、(反面，正面)}
D. {(正面，正面)、(反面，正面)、(正面，反面)、(反面，反面)}
-----------------选择：D
4. 设f(x)=e^(2+x),则当△x→0时，f(x+△x)-f(x)→( )
A. △x
B. e2+△x
C. e2
D. 0
-----------------选择：D
5. 函数y=cosx在[-1,+1]区间的拐点为
A. (0,0)
B. (1,cos1)
C. (-1,cos1)
D. 无拐点
-----------------选择：D
北航《微积分（上）》在线作业二
单选题判断题
二、判断题（共10 道试题，共70 分。

）
1. 函数在一点的左右极限存在和函数的极限存在，是函数在该点连续的充要条件
A. 错误。

15春《统计学》作业2一、单选题【共10道,总分:100分】1.设X～N2X将转化为标准正态分布，转化公式Z=（A.(x-μ)/ δ2B.(x-μ)/ δC.(x)/ δD.(x-δ)/正确答案:B2.若已知A∩B=且已知P(A)=0，则（A. A与B独立B. A与B不独立C. 不一定D. 只有当A=B =ф时，A，B才独立正确答案:A3.当给定显著性水平a=0.55时，参数θ的置信区间P12}=（A. 0.95B. 0.975C. 1.96D. 0.45E.正确答案:D4.X~N22未知，H00，则μ0的拒绝域为（A. t≤-tαB. t≥-tαC. |t-tαD. t≤-tα/2正确答案:A5.置信概率定的愈大，则置信区间相应（A. 愈小B. 愈大C. 不变D. 有效正确答案:B6.显著性水平表达了区间估计的（A. 可靠性B. 不可靠的概率C. 准确性D. 有效性正确答案:B7.若H0=μ0，抽出一个样本，其均值0，则（A. 肯定拒绝原假设B. 有可能拒绝原假设C. 肯定接受原假设D. 以上说法都不对正确答案:C8.置信区间的大小表达了区间估计的（A. 可靠性B. 准确性C. 可靠概率D. 显著性正确答案:B9.若H0=μ0，抽出一个样本，其均值等于μ0，则（A. 肯定接受原假设B. 有可能接受原假设C. 肯定拒绝原假设D. 有可能拒绝原假设正确答案:B10.任一随机事件A的概率P(A)的取值在（A. （0.1）B. [0.1]C. [-1，0]D. （0正确答案:B。