regression coefficient: when the regression line is linear (y = ax + b) the regression coefficient is the constant (a) that represents the rate of change of one variable (y) as a function of changes in the other (x); it is the slope of the regression line
parametric statistic: any statistic computed by procedures that assume the data were drawn from a particular distribution
muskhogean: a member of any of the peoples formerly living in southeastern United States and speaking Muskhogean languages