题目内容

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

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

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

浅静脉留置针置人术适用于：

A.大量输液的病人
B．抢救病人
C.建立长期静脉通道
D.化疗用药
E．门诊少量输液