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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A positive correlation means that as one variable increases, so does the other. In this case, as the temperature increased, so did the incidence of polio outbreaks.

Before Jonas Salk Discovered a Vaccine to Prevent Polio,people Noticed