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【单选题】
土的击实试验中,试筒加湿土质量3425g,试筒质量1214g,试筒容积997cm3,含水量16.7%,则干密度是( )g/cm 3 (取小数2位)
A.
1.95
B.
2.18
C.
1.60
D.
1.88
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とは
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ともかく
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【判断题】Random error affects the measurement in a constant way and represents stable factors that affect the observed score in the same way each time the measurement is made.
A.
正确
B.
错误
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【判断题】Another name for the residual term in a regression equation is random error.
A.
正确
B.
错误
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【判断题】目前还没有一套各馆通用的馆藏目录检索系统,各馆都是根据本馆的特点及实际需要来选择管理系统。
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【简答题】电机转矩由Tm~Tst,转差率由sm~1期间,转矩T( ), 转速( )
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【单选题】Which of the following assumptions concerning the probability distribution of the random error term is stated incorrectly?
A.
The distribution is normal.
B.
The mean of the distribution is 0.
C.
The variance of the distribution increases as X increases.
D.
The errors are independent.
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【单选题】The random error in a regression equation
A.
is the predicted error.
B.
includes both positive and negative terms.
C.
will sum to a large positive number.
D.
is used to estimate the accuracy of the slope.
E.
is maximized in a least squares regression model.
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【单选题】A sample of 250 observations is to be selected at random from an infinite population. Given that the population proportion is 0.25, the standard error of the sampling distribution of the sample propor...
A.
0.0274.
B.
0.50.
C.
0.0316.
D.
0.0548.
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【判断题】According to the text, total measurement error is determined by multiplying systematic error with random error.
A.
正确
B.
错误
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【单选题】which of the following statement is correct for the random error?A, the occurrence probabilities of large error and small error are equal B, the occurrence probability of negative errors is greater th...
A.
wrong
B.
wrong
C.
wrong
D.
True
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【单选题】A sample of 250 observations is to be selected at random from an infinite population. Given that the population proportion is 0.25, the standard error of the sampling distribution of the sample propor...
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0.0548.
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正确
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【单选题】which of the following statement is correct for the random error?A, the occurrence probabilities of large error and small error are equal B, the occurrence probability of negative errors is greater th...
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