Final answer:
The rate of new cases of coronary heart disease in the observed group of 617 men, with 81 developing the condition, is 131.28 cases per 1,000 men per year.
Step-by-step explanation:
To calculate the rate of new cases of coronary heart disease among the observed group, we divide the number of individuals who developed the condition by the total number of individuals observed, and then often multiply that figure by a standard population size to ease comparison and interpretation.
Therefore, the rate of new cases is calculated as 81 new cases per 617 men per year. To express this as a rate per 1,000, we perform the following calculation: (81/617) × 1000, which simplifies to 131.28 cases per 1,000 men per year. In epidemiological studies similar to the one described, the sample, experimental units, explanatory variable.
Treatments, and response variable are important points to be defined. These terms help structure the study and clarify objectives and methodologies. For example, the population might refer to men aged 50 to 84, the sample could be the 400 men who participated.