For each of the following models, state what the expected value of Y is when X = 250. Also, state how the predicted value of Y changes when X increases by 25 units (i.e., a 10% increase). 1. Y = 25 - 5X 2. lnY = 0.5 + 0.01X 3. Y = -60 + 30(lnX) 4. lnY = 2.5 + 0.5(lnX)

		a	b	Value of Y using Old X	Value of Y using New X	25 unit increase in X causes Y to change by following units	10% change in X causes the following %change in Y
1. Y= 25-5X
2. InY= 0.5 +0.01X
3. Y= -60+30(InX)
4 InX= 2.5+0.5(InX)