The state of California reported a total of 1904 cases of pertussis (whooping cough) for all of the year 2013, 12% of which involved infants younger than 6 months. Infants this young cannot be vaccinated yet and must rely on herd immunity for protection from the virus. What is the numerical value, 12%?

Question

Quizplus · Accepted Answer

A parameter is a numerical value that describes a characteristic of a population. In this case, 12% represents the proportion of all pertussis cases in California in 2013 that involved infants younger than 6 months, which is a characteristic of the entire population of cases.

The State of California Reported a Total of 1904 Cases