Before Jonas Salk discovered a vaccine to prevent polio, people noticed a correlation between outside temperature and the incidence of polio: The warmer the temperature over the course of the year, the more outbreaks of polio.This relationship is an example of a(n) ________ correlation.

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The correlation between warmer temperature and the incidence of polio is positive because as the temperature goes up, so does the number of polio outbreaks. This correlation is not spurious because there is a logical connection between temperature and the spread of polio. It is not illusory because the correlation has been observed by multiple sources and has been studied extensively.

Before Jonas Salk Discovered a Vaccine to Prevent Polio, People