What does it mean to say that two variables are negatively correlated?
a. An increase in one variable is associated with a decrease in the other.
b. An increase in one variable is associated with an increase in the other.
c. A decrease in one variable is associated with a decrease in the other.
d. The two variables have no relationship.
Answer: A
Rationale: The more of one variable, the less of the other (such as more sleep being associated with lower irritability).
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