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【简答题】
某企业有 A 、 B 两个投资项目,计划投资额均为 1000 ,其收益 ( 净现值 ) 的概率分布如下表: 市场状况 概率 A 项目净现值 B 项目净现值 好 0.2 200 300 一般 0.6 100 100 差 0.2 50 -50 要求:( 1 )分别计算 A 、 B 两个项目净现值的期望值。 ( 2 )分别计算 A 、 B 两个项目期望值的标准差。 ( 3 ) 判断 A 、 B 两个投资项目的优劣。
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举一反三
【判断题】A summary measure that is computed from a sample to describe a characteristic of the population is called a statistic.
A.
正确
B.
错误
【单选题】A F-statistic is used to test the hypothesis that:
A.
MSE equals 0.
B.
two population variances are equal.
C.
a z-statistic is greater than 0.
D.
a z statistic less than a t statistic.
【判断题】A point estimate consists of a single sample statistic that is used to estimate the true population parameter.
A.
正确
B.
错误
【单选题】To use a z normal statistic in a one-sample hypothesis test of a population mean, we need to know ( )
A.
the population mean.
B.
the population standard deviation.
C.
the degrees of freedom.
D.
the margin of error.
【判断题】An assumption underlying the use of t -statistic in sample-based estimation is that the population is normally distributed.
A.
正确
B.
错误
【判断题】The difference between the sample statistic and actual value of the population parameter is the confidence level of the estimate.
A.
正确
B.
错误
【判断题】When a statistic calculated from sample data is used to estimate a population parameter, it is called a point estimate.
A.
正确
B.
错误
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