You can draw a straight line through the data, not by connecting the points, but by approximating a line that passes as near to as many of the points as possible. If there is a linear relationship between volume and mass, a graph will show that the data points look like they connect in a straight line (or nearly so). Part 2: Linear Regression and The Equation of a Line Linear regression analyzes how well two variables are related to each other by fitting a linear equation to the data. The mass is the dependent variable (assigned y-values) since mass was recorded in response to the change in volumes. Volume and mass measurements of an unknown metal Volume (mL) Mass (g) 2.00 5.100 3.10 8.900 4.00 10.900 5.30 13.800 Here, the volume is displayed as the independent variable (assigned x-values) since the volume was manipulated approximately every 1 mL (specific volumes were selected for measurement of the corresponding masses). Part 1: Dependent and Independent Variables Sample data below show how the mass changes with volume of an unknown metal. This lab will give you some practice using these programs, especially since you will need to graph data many times in your chemistry courses. Microsoft’s Excel is a spreadsheet program that allows you to analyze and graph data. BC CHEM& 162 Activity Graphical Analysis with Excel and Logger Pro Purpose Vernier’s Logger Pro is a graphical analysis software that will allow you to collect, graph and manipulate data.
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