All career-technical students routinely gather data to analyze situations, make predictions, and report results of tests or experiments. Whenever two related items of mathematical data (bivariate data) are produced, the career-technical teacher and mathematics teachers can use this lesson to plot the data points on a graph, show the regression line, and find the centroid. Data such as weight and height, density and weight, diameter and length, age and weight, and stocking density and area are just a few examples of what can be plotted to scale by the applet in this resource. The input can be set as the independent variable and the output can be set as the dependent level. The scale of the x and y axes can be changed to show how the location of the centroid and regression line change as the axis is lengthened or shortened. Manufacturing Technologies instructors can use this resource to show where the centroid on a metal plate should be drilled. Mathematics teachers are encouraged to use the expertise of their career-technical students to gather and analyze data for illustration purposes in their mathematics courses.