一、单项选择题(每题2分,共40分) 1、构成统计总体的必要条件是() A、差异性 B、综合性 C、社会性 D、同质性

一、E(Y)的置信区间 二、Y的置信区间

1 Stationarity and unit Root testing WHy do we need to test for Non-Stationarity? The stationarity or otherwise of a series can strongly influence its behaviour and properties -e.g. persistence of shocks will be infinite for nonstationary series Spurious regressions. If two variables are trending over

The culture concept is fundamental to anthropology Years ago, we used to have more trouble introducing the concept, because people tended to think of the other meaning of culture, i.e., high culture, esp. art, music, refinement

1函数项级数的一致收敛性 点态收敛 设un(x)(n=1,2,3,…)是具有公共定义域E的一列函数,这无穷个函数的“和

1.求下列曲线所围的图形面积: (1)y=-,y=x,x=2; (2)y2=4(x+1),y2=4(1-x); (3)y=x,y=x+sin2x,x=0,x=π; (4)y=ex,y=e-x,x=1;

1.利用极坐标计算下列二重积分 (1)∫e-ddy,其中D是由圆周x2+y2=R2(R>0)所围区域;

1.讨论下列函数序列在指定区间上的一致收敛性。 (1)Sn(x)=e-, ()x∈(0,1), (i)x∈(1,+∞);

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202.The length of a sound is the length of time during which it is held on continuously in a given word or phrase. The principal facts concerning length in English are given in the following rules: 203. Length of vowels 1.English vowels [i:], are longer than the other English vowels in similar context,i.e when surrounded by the same sounds, and pronounced with the same degree of stress Thus the vowels in bead