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【单选题】
导致慢性肺心病的最常见原因是A.
支气管哮喘
B.
COPD
C.
肺结核
D.
肺炎
E.
呼吸衰竭
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反馈参考答案：
举一反三
【单选题】Which of the following is true of standard error?
A.
It can take negative values.
B.
It is an estimate of the standard deviation.
C.
It is the square root of the variance.
D.
It complicates the computation of confidence intervals.
【单选题】The standard error of the mean is:
A.
the standard deviation of the sampling distribution of sample means.
B.
always normally distributed.
C.
sometimes less than 0.
D.
the variance squared.
【简答题】测量的标准误(standard error of test)
【单选题】The standard error of estimate is based on:
A.
squared deviations from the regression line.
B.
negative values.
C.
squared units of the independent variable.
D.
the regression mean square error.
【判断题】Standard error is a kind of standard difference and it could be used indicate the extent of sampling error.
A.
正确
B.
错误
【单选题】The multiple standard error of estimate is:
A.
found by taking the square root of SSR/SS total.
B.
negative when one of the net regression coefficients is 0.
C.
based on the term, (Y – Ŷ) 2.
D.
the error of estimating the regression coefficients.
【简答题】率的标准误(standard error of rate)
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