题目内容

The main advantage of using multiple regression analysis over differences in means testing is that the regression technique

A. allows you to calculate p-values for the significance of your results.
B. provides you with a measure of your goodness of fit.
C. gives you quantitative estimates of a unit change in X.
D. assumes that the error terms are generated from a normal distribution.

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In a multiple regression framework, the slope coefficient on the regressor X2i

A. takes into account the scale of the error term.
B. is measured in the units of Yi divided by units of X2i.
C. is usually positive.
D. is larger than the coefficient on X1i.

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Consider the multiple regression model with two regressors X1 and X2, where both variables are determinants of the dependent variable. You first regress Y on X1 only and find no relationship. However when regressing Y on X1 and X2, the slope coefficient of X1changes by a large amount. This suggests that your first regression suffers from

A. heteroskedasticity
B. perfect multicollinearity
C. omitted variable bias
D. dummy variable trap

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行浅静脉留置针置入术时，其进针角度以多少度为宜：

A．15～30度
B．35～45度
C．45～50度
D．5～10度
E．50～55度

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静脉留置针一般留置多长时间为宜：

A. 3～5d
B.8～10d
C.11～13d
D．14～15d
E．16～20d

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The main advantage of using multiple regression analysis over differences in means testing is that the regression technique

A. allows you to calculate p-values for the significance of your results. B. provides you with a measure of your goodness of fit. C. gives you quantitative estimates of a unit change in X. D. assumes that the error terms are generated from a normal distribution.

In a multiple regression framework, the slope coefficient on the regressor X2i

行浅静脉留置针置入术时，其进针角度以多少度为宜：

静脉留置针一般留置多长时间为宜：

A. allows you to calculate p-values for the significance of your results.
B. provides you with a measure of your goodness of fit.
C. gives you quantitative estimates of a unit change in X.
D. assumes that the error terms are generated from a normal distribution.