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【单选题】
证券投资基金（ ）。A.
起源于美国，盛行于日本
B.
起源于美国，盛行于英国
C.
起源于英国，盛行于美国
D.
起源于英国，盛行于日本
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举一反三
【单选题】In a hypothesis test comparing two population means, we use the z distribution when:
A.
the two population standard deviations are equal.
B.
both populations have at least 4000 observations.
C.
both population standard deviations are known.
D.
nπ and n(1-π) are both greater than 5.
【简答题】媒介文化引导消费,体现在哪些方面
【单选题】In a one-tailed hypothesis test:
A.
the rejection region is in only one of the tails of a distribution.
B.
the rejection region is split between the tails of a distribution.
C.
the area of the rejection region equals the p-value.
D.
the area of the rejection region is twice the value of the p-value.
【单选题】In performing a hypothesis test where the null hypothesis is that the population mean is 23 against the alternative hypothesis that the population mean is not equal to 23, a random sample of 17 items ...
A.
17
B.
16
C.
15
D.
2
E.
1
【单选题】To use a z statistic in a one-sample hypothesis test of a mean, we need to know:
A.
the population mean.
B.
the population standard deviation.
C.
the degrees of freedom.
D.
the margin of error.
【单选题】In a hypothesis test comparing two means of the independent normal populations, we use the z distribution test statistic when ( )
A.
both population standard deviations are known.
B.
the two population standard deviations are unkown.
C.
the two population standard deviations are equal.
D.
Both B and C
【单选题】某工作在放大状态的三极管,当基级电流IB由60μA降低到40μA时,集电极电流IC由2.3mA降低到1.5mA,则此三极管的动态电流放大系数β为( )。
A.
37.5
B.
38.3
C.
40
D.
57.5
【单选题】Which of the following statements is NOT true about the level of significance in a hypothesis test?
A.
The larger the level of significance, the more likely you are to reject the null hypothesis.
B.
The level of significance is the maximum risk we are willing to accept in making a Type I error.
C.
The significance level is also called the level.
D.
The significance level is another name for Type II error.
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