Question

a correlation coefficient of -1.0 between two sets of numbers indicates
multiple choice
a complete lack of any correlation between the two sets.
that when one set of numbers goes up, so does the other set.
that when one set of numbers goes up, the other set goes down.
a positive correlation between the two sets.
an indefinite relationship between the two sets.

Explanation:

A correlation coefficient ranges from -1 to +1. A value of -1 represents a perfect negative linear correlation, meaning the two variables move in perfectly opposite directions. A value of 0 means no correlation, and +1 means a perfect positive correlation (variables move in the same direction).

Answer:

that when one set of numbers goes up, the other set goes down.