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

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) positive
B) causal
C) illusory
D) negative
E) spurious