At an initial examination of civil service employees, 1,950 were free of coronary heart disease. A total of 20 new cases of coronary heart disease occurred during the subsequent one-year period. Assume follow-up was complete for all civil service employees. The one-year cumulative incidence of coronary heart disease per 1,000 persons, rounded to one decimal place, was.

b

explanation:

the u.s. census bureau produces data on the population and economy nationwide. it can you to analyze the kind of people living in your neighborhood. it does not show you the market of people willing to buy your product or an existing market for your product. that will require more market research. the census bureau only gives you an insight to the demographics in your area.