is a type of research design that uses previously gathered data to test a new hypothesis or explore new relationships among variables.

Which term best describes the association between variables a and b? no association a negative linear association a positive linear association a nonlinear association a scatterplot with an x axis labeled, variable a from zero to ten in increments of two and the y axis labeled, variable b from zero to one hundred forty in increments of twenty with fifteen points in a positive trend.

If a || b and b | y, then ? a) x || y. b) x | a. c) a | y. d) a || y.

A50% increase followed by 33 1/2% decrease