8.3 An experiment determines two parameters , and 12 and finds values y, = 1.0 and 12 = -1.0 with a variance matrix V(1) 2.0 -1.0 -1.0 1.5 X 10 2 A second experiment finds a new value of 12 to be y, = -1.1 with a variance 10-2, Find the least-squares estimates for , and /2 and their associated error matrix