The estimated regression equation for a model involving two independent variables and 10 observations follows. ŷ = 26.0336 + 0.5179z1 + 0.7599x2 a. Interpret by and by in this estimated regression...

Extracted text: The estimated regression equation for a model involving two independent variables and 10 observations follows. ŷ = 26.0336 + 0.5179z1 + 0.7599x2 a. Interpret by and by in this estimated regression equation. %3D b1 y changes by 0.5179 when x1 increases by 1 unit and x2 stays the same y changes by 0.7599 when x2 increases by 1 unit and x1 stays the same b. Estimate y when a1 = 180 and æz = 310 (to 3 decimals).