The intercept in the multiple regression model
A. should be excluded if one explanatory variable has negative values.
B. determines the height of the regression line.
C. should be excluded because the population regression function does not go through the origin.
D. is statistically significant if it is larger than 1.96.
The term “linear” in a multiple linear regression model means that the equation is linear in parameters.
A. 对
B. 错
中心静脉压测定的正常值：( )
A. 5-12cmH2O
B. 5-14cmH2O
C. 3-12cmH2O
D. 2-12cmH2O
中心静脉压增高或降低，期临床意义提示( )
A. 心功能不全
B. 心律不齐
C. 血压变化
D. 有效循环
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