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Before Jonas Salk Discovered a Vaccine to Prevent Polio, People

Question 6

Multiple Choice

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.


A) negative
B) positive
C) spurious
D) illusory

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