Author: Matt Carter at Credible.com

One of the most common types of graphs is statistics and in the quantitative sciences is a scatterplot.  A scatterplot is a way of displaying bivariate data: that is, data in which we measure two different variables for each participant.  For example, suppose we ask several people both their age & their weight, or both…

Fact: One type of chart about which the GMAT DI can ask is a bubble chart. What in Sam Hill is a bubble chart?   Scatterplots A bubble chart is a close cousin to a scatterplot.  In a scatterplot, each data point has values in two different variables, and for each data point, its vertical…

One reason we graph data in a scatterplot is because we are looking for patterns.  The simplest of all possible patterns to find on a scatterplot is a straight line pattern. Correlation When the points on a scatterplot lie more or less in a straight-ish line, that is called correlation.  When it’s a straight line…