# Statistics Ch 4

 Scatterplots One axis represents each variable, data plotted as points Response /Dependent variable measures or records the outcome (y-axis) Explanatory /Independent variable explains changes in the response variable (x-axis) Form linear, non-linear, no relationship, curved, clustered Direction positive, negative, no direction Strength how much scatter around the main form Outliers deviations from the main pattern Correlation Correlation coefficient (r) - a measure of the direction and strength of a relationship. It iscalculated using the mean and the standard deviation of both the x and y variables. r ranges from -1 to +1When variability in one or both variables decreases, the correlation coefficient getsstronger (closer to +1 or −1).Correlations are calculated using means and standard deviations and thus are NOTresistant to outliers. Authorfirefly501 ID137595 Card SetStatistics Ch 4 DescriptionScatterplots and Correlation Relationship between two variables Updated2012-02-25T16:58:27Z Show Answers