Calculating power requires inputs, some of which are facts and some of which are decisions. Which of the following inputs are decisions when calculating power for a cohort study? Sample size and ratio of exposed to unexposed Prevalence of the outcome in the unexposed and alpha Effect size and alpha Ratio of exposed to unexposed and effect sizeCalculating power requires inputs, some of which are facts and some of which are decisions. Which of the following inputs are decisions when calculating power for a cohort study? Sample size and ratio of exposed to unexposed Prevalence of the outcome in the unexposed and alpha Effect size and alpha Ratio of exposed to unexposed and effect size