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.

Question

Quizplus · Accepted Answer

A positive correlation means that two variables move in the same direction. In this case, higher temperatures are associated with more outbreaks of polio, so the correlation is positive.

Before Jonas Salk Discovered a Vaccine to Prevent Polio, People