In an observational study over 20 years, a sample of Swedish men reported the amount of fish in their diet (none/small or moderate/large) and whether they developed prostate cancer (yes or no) Yes No
None/Small 120 1310
Moderate/Large 105 1649

Required:
If these observations are representative of the larger populations of all Swedish men, what's the difference between the proportions of prostate when comparing the two diet group? Interpret your answer with confidence.