出自:佳木斯大学语言治疗学

随机变量的条件均值与非条件均值是一回事。( )
·正确
·错误
线性回归模型意味着变量是线性的。( )
·正确
·错误
双对数模型中的斜率表示因变量对自变量的弹性。( )
·正确
·错误
一个联立方程模型中的外生变量在另一个联立方程模型中可能是内生变量。( )
·正确
·错误
如果一个时间序列呈上升趋势,则这个时间序列是平稳时间序列。( )
·正确
·错误
内生变量是理论或模型所要解释的变量,即因变量,它是为理论或模型以外的因素所影响的变量,是具有某种概率分布的随机变量。( )
·正确
·错误
在对单个正态总体均值的假设检验中,当总体方差已知时,选用( )
·检验法
·检验法
·检验法
·检验法
设某个假设检验问题的拒绝域为W,且当原假设H0成立时,样本值(x1,x2, …,xn)落入W的概率为0.15,则犯第一类错误的概率为( )
·0.1
·0.15
·0.2
·0.25
假设检验时,若增大样本容量,则犯两类错误的概率( )。
·都增大
·都减少
·都不变
·一个增大一个减少
如果回归模型中的随机误差存在异方差性,则参数的普通最小二乘估计量是( )
·无偏的,但方差不是最小的
·有偏的,且方差不少最小
·无偏的,且方差最小
·有偏的,但方差仍最小
在经济数学模型中,依据经济法规认为确定的参数,如税率、利息率等,称为( )
·定义参数
·制度参数
·内生参数
·短期均衡关系
一元线性样本回归直线可以表示为( )
·
·
·
·
在具体的模型中,被认为是具有一定概率分布的随机变量是()。
·内生变量
·外生变量
·虚拟变量
·前定变量
在同一时间不同统计单位的相同统计指标组成的数据组合为( )。
· 原始数据
· 时间序列数据
· 数据
· 截面数据
反映由模型中解释变量所解释的那部分离差大小的是( )。
· 总体平方和
· 回归平方和
· 残差平方和
· 样本平方和
( )参数的估计量具备有效性是指:
·
·为最小
·
·为最小
( )设Q为居民的猪肉需求量,I为居民收入,PP为猪肉价格,PB为牛肉价格,且牛肉和猪肉是替代商品,则建立如下的计量经济学模型:根据理论预期,上述计量经济学模型中的估计参数、和应该是:
·<0,<0,
·<0,>0,
·>0,<0,
·>0,>0,
( )利用OLS估计模型求得的样本回归线,下列哪些结论是不正确的:
·样本回归线通过()点
·=0C3
·
·
( )用一组有20个观测值的样本估计模型后,在0.1的显著性水平下对的显著性作t检验,则显著地不等于零的条件是t统计量绝对值大于:
· t0.1(20)
· t0.05(20)
· t0.1(18)
· t0.05(18)
( )对模型进行总体线性显著性检验的原假设是:
·
·,其中
·
·,其中
( )对于如下的回归模型中,参数的含义是:
·X的相对变化,引起Y的期望值的绝对变化量
·Y关于X的边际变化率
·X的绝对量发生一定变动时,引起Y的相对变化率
·Y关于X的弹性
( )如果回归模型为背了无序列相关的假定,则OLS估计量:
·无偏的,非有效的
·有偏的,非有效的
·无偏的,有效的
·有偏的,有效的
( )下列检验方法中,不能用来检验异方差的是:
·格里瑟检验
·戈德菲尔德-匡特检验
·怀特检验
·杜宾-沃森检验
( )在对多元线性回归模型进行检验时,发现各参数估计量的t检验值都很低,但模型的拟合优度很高且F检验显著,这说明模型很可能存在:
·方差非齐性
·序列相关性
·多重共线性
·模型设定误差
在一元线性回归模型中,样本回归方程可表示为( )。
·
·
·
·
根据样本资料估计人均消费支出Y对人均收入X的回归模型为,这表明人均收入每增加1%,人均消费支出将增加( )。
· 0.75%
· 0.2%
· 2%
· 7.5%
Each language usually contains ____.
· two thousand words
· hundreds of words
· different kinds of words
· many thousands of words
Before you leave your school you will lear____.
· only
· five hundred thousand words
· three or
· more thaone thousand words
The number of different languages spokeis about ____.
· 150
· 1,500
· 500
· 15,000
Smokers become _______ to nicotine, and ostopping smoking the suddeloss of nicotine cacause unpleasant illnesses.
·belong
·addict
·addicted
·belonged
The word “attorney” ( paragraph 3) means______.
·the judge
·the lawyer
·the jury
·the defendant
– Do you think it OK if I postpone my Tuesday’s appointment till Wednesday – __________________
·Yes, you can.
·No problem.
·No, you can’t.
·I have something to do then.
– It’s my fault. –
·Don’t blame yourself.
·You should be more careful.
·Bad luck!
·Next time do better.
The president suggested that a UN observer _______ the conference.
·attended
·attending
·should attend
·would attend
What did Ron’s father think about his leaving school
·He thought his sowas doing the right thing.
·He advised him to stay at school to complete his education.
·He was against it.
·He knew there was a job for every boy who wanted one.
– This is the worst film ever produced. –____________________________!
·You said it
·I don’t mind
·Not at all
·No, that’s not real
–How long will your holiday take –____________________.
·About one month
·It starts othe 15th of March
·It took one month
·About oApril 15
According to the author, compassiomay be the queeof Americavirtues because ________.
·it is the virtue Americans respect most
·it is as noble as a queen
·it is from the Bible
·it is showed by the “the Good Samaritan”
Where cawe read the passage ( )
·Ia cartoon.
·Ia magazine.
·Ia travel book.
·Ia storybook.
Which of the following is NOT true ( )
·Both a facial expressioand crossed arms are body language.
·Giving examples is the only way to teach childrebody language.
·Body language cagive people important information.
·People sometimes want to use their body language.
Which of the following is NOT the advantage (好处) of using body language ( )
·Making a difference ischool.
·Being helpful to personal safety.
·Getting something you want.
·Stopping misunderstandings.
What does the underlined word "thoughtful" mea( )
·Talking quietly.
·Looking directly.
·Speaking loudly.
·Thinking deeply.
A persowho feels ____ may not want to eat.
· happy
· shy
· unhappy
· well
The judges iold England thought if a madidn’t tell the truth, he ca____.
· drink milk or tea
· eat a lot of bread
· hardly eat dry bread
· swallow dry bread easily
It is good for us to have our meal ____ every day.
· earlier
· at the same time
· at ant time
· at the different
It is good to eat sweets and ice cream ____.
· after a meal
· before a meal
· whewe are hungry
· whewe want to eat
Good eating habits make us ____.
· stronger
· happier
· more
· more polite
Which of the following is NOT mentioned ithe passage
·Foreignegotiators are willing to invest time irelationship betweenegotiators.
·Americanegotiator’s directness and impatience cause cross-cultural misunderstanding.
·Americans has played a more effective role iinternational business negotiations.
·Foreignegotiators think that Americacaafford to pay the price without bargaining
The best title for this selectiois ________.
·How We See
·Learning about Our Minds through Science
·Color and People
·How to Become a Psychologist
Which of the following is TRUE
·We have chances to receive three different answers from three people.
·It is likely that we will receive three different answers from three people.
·It is proved that we will receive three different answers from three people.
·It is impossible that we will receive three different answers from three people.
首页 <上一页 258 259 260 261 262 下一页> 尾页