For each of these tables of x- and y-values, decide if the values indicate a direct variation, an inverse variation, or neither. Explain how you made your decision. If the values represent a direct or inverse variation, write an equation.

Elementary Statistics Math 124-08 Vera Klimkovsky 21 September 2016 Chapter 4 – Scatter plots and Correlation Chapter 4 – Scatter plots and Correlation Scatter plot ( XY plot) 3 ways to describe a scatter plot: o Form: Linear or Nonlinear o Direction: Positive or Negative ( could also be neither) o Strength: Strong, Moderate, Weak Ex: Two Quantitative Variables X : Age of a car Y: Price of a car Linear Correlation (r) – the measure of strength and direction of a linear association between quantitative variables X & Y Properties of Correlation Correlation makes no distinction between explanatory and response variables Both variables should be quantitative The changing of units doesn