1)As described in the textbook, validation of a simulation involves insuring that the simulation yields "correct" results when compared to the results of the actual real-world system. If this is so, why run simulations at all? Why not just use the results of the actual situation which we obviously already know
2)A machine shop has two machines, A and B. Four jobs need to be processed through machine A first and B second. Job 1 will take one hour on machine A and three hours on machine B. Job 2 will take three hours on A and two hours on B. Job 3 will take seven on A and three on B. Job 4 will take five hours on A and one hour on B. Using Johnson's rule, in what order should these jobs be done