A local health department has implemented a needle exchange program, aimed at reducing the spread of STDs by providing clean syringe needles to the public when dirty needles are disposed of at the facility. The local health department analyzes data to better understand the health problem within the community. Which of the following core functions of public health would relate to this particular task?One work site has 100 employees, organized into 5 teams of 20 employees each. Luke surveys all 20 members of one of these teams and finds that 10 of them use public transportation to commute to work. Luke concludes that about 50 of all the work site's employees use public transportation to commute to work. The argument above depends on which of the following assumptions