Question 8 Hello I need the answers for each part of the problem please, thank you

5 IAZUZ'J 'I'all ZUZ'I SECIIODS UM5 and 1M4 Lame Ann Lona '3 ! \"IOU/[l 10:50 PM Question 8, 20.CE.31 HW Score: 67.45%. 11.47 of 17 points @ Part1 or 3 @ Points: 0.6 of 1 Men diagnosed with cancer were randomly assigned to either undergo surgery or not. Among the 333 men who had the surgery, 19 eventually died of cancer, compared with 25 cf the 336 men who did not have surgery. 3) Was this an experiment or an observational study? Explain. 1)) Create a 90% condence interval for the difference in rates of death for the two groups of men. c) Based on your condence interval, is there evidence that surgery may be effective in preventing death from cancer? Explain