please help: A case-control study was conducted to assess the association between exposure to chemical solvents and bladder cancer.  The researcher assembled a sample of 55 cases and 2820 controls.  Among the cases, 45 had been exposed to solvents; among the controls, 1880 had been exposed. Using these hypothetical data, what is the odds ratio for the association between chemical solvents and bladder cancer? 9.1   2.25   4.0   2.55

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