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A negative correlation means
A) a third variable eliminates a correlational relationship
B) one variable decreases as the other increases
C) there is a relationship between two variables, but it is not statistically significant
D) two variables increase together, but they are associated with an undesirable outcome
A group of scientists in the Everglades are studying a heron population. They are in the birds' natural setting, but they don't want to interfere with the birds. What type of research are they performing?
A a controlled experiment
B opinion-based research
C a tab investigation
D observational research
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