For this​ problem, use the multiple regression equation below to complete parts ​(a) and ​(b).

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For this problem, use the multiple regression equation below to complete parts (a) and (b).

Y^  = 10 + 5X1i + 3x2i

a. Interpret the meaning of the slopes.

A. If Upper X1 increases one unit, Y increases 5 units.  If Upper X2 increases one unit, Y increases 3 units.
B. If Upper X2 is constant, when Upper X1 increases one unit, Y increases 3 units.  If Upper X1 is constant, when Upper X2 increases one unit, Y increases 5 units.
C. If Upper X2 is constant, when Upper X1 increases one unit, Y increases 5 units.  If Upper X1 is constant, when Upper X2 increases one unit, Y increases 3 units.
D. If Upper X1 increases one unit, Y increases 3 units.  If Upper X2 increases one unit, Y increases 5 units.

b. Interpret the meaning of the y - intercept

b. Interpret the meaning of the​ Y-intercept.
A. The​ Y-intercept 5 is the estimate of the mean value of Y if Upper X1 is 0.
B. The​ Y-intercept 10 is the estimate of the mean value of Y if Upper X1 is 0.
C. The​ Y-intercept 10 is the estimate of the mean value of Y if Upper X1 and Upper X 2
are both 0.
D. The​ Y-intercept 5 is the estimate of the mean value of Y if Upper X1 and Upper X 2
are both 0.