Question: In a multiple regression model involving two independent variables, if b1 is +3.0, it means that: (a) The relationship between X1 and Y is significant.

In a multiple regression model involving two independent variables, if b1 is +3.0, it means that:

(a) The relationship between X1 and Y is significant.

(b) The estimated value of Y increases by 3 units for each increase of 1 unit of X1, holding X2 constant.

(c) The estimated value of Y increases by 3 units for each increase of 1 unit of X1, without regard to X2.

(d) The estimated value of Y is 3 when X1 equals zero.

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