The Framingham Heart Study is a prospective cohort study that established the key risk factors for heart disease. Early in the study, investigators were interested in evaluating systolic blood pressure (SBP) as a risk factor for coronary heart disease (CHD). SBP was measured in all participants at study entry. Cumulative incidence of CHD over the next 24 years was tabulated and reported. Assume no loss to follow-up during this time period. Framingham Heart Study investigators wanted to determine if there were differences in systolic blood pressure when comparing those who developed CHD compared to those who did not develop CHD during the follow-up period.

State the null and alternative hypotheses in words and using statistical notation.