ABSTRACT
The statistical techniques deal with bivariate relationships between two interval-ratio variables in terms of whether, and how strongly, they are associated together. This chapter explores a simple graphing technique called a scattergram that is used to illustrate relationships between two variables. Similar to histograms and frequency polygons, scattergrams entail the graphic charting of two variables. This is accomplished by the use of intersecting axes; the horizontal axis represents the independent variable, while the vertical axis represents the dependent variable. A dot is used to represent each measurement of the independent variable in comparison to the dependent variable. While a scattergram provides a picture of a relationship between two variables, it does not indicate exactly where the fitted line actually belongs. The chapter discusses the important statistical technique of simple linear regression, Pearson's-r, and the newly introduced t-test of significance. Similar techniques for ordinal and nominal variables are also considered.
