Many statistical studies involve more than one variable.
A scatterplot represents a graphical display that allows one to observe a possible relationship between two quantitative variables. When we think that changes in a variable x explain , or even cause , changes in a second variable y, we call x an explanatory variable and y a response variable. When examining a scatterplot, look for an overall pattern . These words and phrases relate to scatterplots. Using the TI-83, this can be done very easily with a histogram or a boxplot.