A farmer is interested in determining the effect of fertilizer use, water use, and natural disaster on his corn yield. He estimates a regression and obtains the following results: yield = 23 + 3.2fertilizer + 2.1water - 6.5storm In the equation, fertilizer is measure in lb/acre, water is measured in gallons/acre, yield is measured in bu/acre, and the variable storm is a dummy variable that takes the value 1 if a storm happens and O if a storm does not happen. What is the effect of water on yield? If water use decreases by 1 gallons/acre yield will decrease by 23 bu/acre If water use decreases by 1 gallons/acre yield will increase by 23 bu/acre If water use decreases by 1 gallons/acre yield will decrease by 23+ 2.1 = 25.1 bu/acre If water use decreases by 1 gallons/acre yield will increase by 2.1 bu/acre If water use decreases by 1 gallons/acre yield will decrease by 2.1 bu/acre If water use decreases by 1 gallons/acre yield will increase by 23 + 2.1 = 25.1 bu/acre