Let's a function f(x) = C1 +C2x where x is page number. You want to predict the price b_hat = f(x). We have been provided by two vectors. a is the page vector and b is the price vectors. You have to calculate ci and c2 so that the (1/n )||b-b hat ||? would be minimized. Where b hat = C1+C2a. Therefore, you need to estimate c, and c2 such that (1/n)|| b- c1 - C2 a||2 would be minimized. Show that std(b) Pab std(a) C2 = and C1 = avg(b) avg(a)c2