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【简答题】
If we agree that the function of education is to prepare us for life, then there is very little time to waste. So, while we can, we ought to concentrate on teaching children something really useful. Here is what our schools should teach. Politeness is a mark of civilization. The sooner children learn this, the better. In any case, a lot can be accomplished by a smile and good manners. Like it or not, our adult lives will be consumed by the struggle for money, but we don’t make an effort to teach children how to manage it. So our schools have a duty to teach them this ability from the beginning. We’re likely to accept something we are told, but that’s not what educated people do. Educated people are reasonable and they look at facts. If our schools teach nothing else, they should at least teach critical(批判性的)thinking. Children should learn to take care of their health. They should know that if they eat junk food, they will become fat and unhealthy. They should be very clear about what happens to their bodies when they drink or smoke. All of us are part of society. We have rights and responsibilities. We ought to understand what they are. We have to know a little bit of history and geography, because we need to have an environment in which to relate to the people around us. How will we test students on these? We can’t. But that’s not a reason to avoid teaching what is important. Our schools should spend every moment they have telling this to our children: ”This is life, this is what you are going to face, and this is how you deal with it.” Title Very 小题1: In Schools Introduction Education should be a 小题2: for life. Advice Useful things should 小题3: in schools. Teaching 小题4: ●How to behave 小题5: ●The basic skill of 小题6: money ●How to think in 小题7: ●How to 小题8: ●The rights and responsibilities one has in 小题9: Conclusion Children should be taught what life is and how to 小题10: it.
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举一反三
【单选题】设X1,X2,......,Xn为来自于总体P( 入 )的简单随机样本(这里的1,2,......,n均为下标,下同),统计量T=(X1+X2+......+Xn)/n,则E(T)和D(T)分别为
A.
E(T)=入,D(T)=入
B.
E(T)=入,D(T)=入/n
C.
E(T)=入/n,D(T)=入
D.
E(T)=入/n,D(T)=入/n
【简答题】设总体的概率分布或密度函数为f(x;θ),其中参数θ已知,记p=P(x>a 0 ),样本X 1 ,X 2 ,…,X n 来自于总体X,则求参数p的最大似然估计量 .
【判断题】加在电阻上的电压增大到原来的2倍时,它所消耗的电功率也增大到原来的2倍。
A.
正确
B.
错误
【判断题】加在电阻上的电压增大到原来的2倍时,它所消耗的电功率也增到原来的2倍。()
A.
正确
B.
错误
【简答题】设总体X服从均匀分布U[0,θ],样本X 1 ,X 2 ,…,X n 来自于总体X,求参数θ的置信度为1-α的置信区间.
【单选题】下列物质按SN1反应活性从高到低排序是:A【图片】B【图片】C【图片】D【图片】
A.
CABD
B.
DBAC
C.
CBDA
D.
ACBD
【简答题】设总体X~N(μ,σ2),(X1,X2,…,Xn)是来自该总体的样本.样本均值为X,样本方差为S2. (1)设n=25,求P(μ一0.2σ< <μ+0.2σ}; (2)要使P{| 一μ|>0.1σ}≤0.05,问样本容量n至少应等于多少? (3)设n=10,求使P{μ—λS< <μ+λS)=0.90的λ; (4)设n=10,求使P{S2>λσ2}=0.95的λ.
【单选题】下列有关证券登记结算机构的说法,正确的是( )。 1投资者委托证券公司进行证券交易,可以不开立证券账户 2证券登记结算机构不得挪用客户的证券 3证券登记结算机构应当按照规定,以投资者本人的名义为投资者开立证券账户 4证券登记结算机构按照业务规则收取的各类结算资金和证券,必须存放于专门的清算交收账户
A.
①③
B.
②④
C.
①③④
D.
②③④
【单选题】设X1,X2,......,Xn为来自于总体N(2,4)的简单随机样本(这里的1,2,......,n均为下标,下同),统计量T=(X1^2+X2^2+......+Xn^2)/n(这里的Xi^2是指Xi的平方),则E(T)=
A.
8
B.
8n
C.
8/n
D.
8/(n^2)
【单选题】下列有关证券登记结算机构的说法,正确的是()。 1投资者委托证券公司进行证券交易,可以不开立证券账户 2证券登记结算机构不得不得挪用客户的证券 3证券登记结算机构应当按照规定,以投资者本人的名义为投资者开立证券账户 4证券登记结算机构按照业务规则收取的各类结算资金和证券,必须存放于专门的清算交收账户
A.
①③
B.
②④
C.
①③④
D.
②③④
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