Example 2: smoking and asthma
health officials in milwaukee, wisconsin, were concerned about teenagers with asthma. people with asthma often have difficulty with normal breathing. in a local research study,
researchers collected data on the incidence of asthma among students enrolled in a milwaukee public high school.
students in the high school completed a survey that was used to begin this research. based on this survey, the probability of a randomly selected student at this high school
having asthma was found to be 0.193. students were also asked if they had at least one family member living in their house who smoked. the probability of a randomly selected
student having at least one member in his (or her) household who smoked was reported to be 0.421.