A university conducts a TOEFL test for students majoring in management, the management department believes that the average student TOEFL test score is 470 with a known standard deviation of 10, then the management department takes a sample TOEFL test score data from 9 students as follows: TOEFL Score: Andy: 410 Bonos: 460 Cici: 485 Desi: 509 Eni: 496 Fifi: 477 Dashing: 457 Hamid: 465 Imran: 495 The hypothesis put forward by the management department is as follows: H0 : = 470 H1 : 470 By using = 5%, testing in two tails (two sides), test this opinion and give the conclusion