The ____________________ correlation coefficient is used to look for a relationship between x and y when both variables are interval but do not have normal distributions.

Correlation Coefficient

A rephrased definition from KT-15: A numerical index ranging from -1 to 1 that indicates the extent to which two variables have a linear relationship.

Interval Variables

Another term for interval data, indicating variables measured along a scale on which each point is placed at equal distance from one another, with meaningful quantifiable differences but without a true zero.