Take a look at the data and as yourself these questions.Most people start by eye-balling the data. Instead, the idea is to get a line that has equal numbers of points on either side. In many cases, the line may not pass through very many of the plotted points. How do I construct a best-fit line?Ī best-fit line is meant to mimic the trend of the data.
#MAKE A SCATTER PLOT WITH LINE OF BEST FIT HOW TO#
Work through it and the sample problems if you are unsure of how to complete questions about trends and best-fit lines. This page is designed to help you complete any of these types of questions. You may also be asked to approximate the trend, or sketch in a line that mimics the data. If you find yourself faced with a question that asks you to draw a trend line, linear regression or best-fit line, you are most certainly being asked to draw a line through data points on a scatter plot. All of these applications use best-fit lines on scatter plots (x-y graphs with just data points, no lines).
For predictive purposes, we might prefer to know how often an earthquake is likely to occur on a particular fault or the possibility of a very large flood on a given river. We want to know if there is a relationship between the amount of nitrogen in the water and the intensity of an algal bloom, or we wish to know the relationship of one chemical component of a rock to another. In introductory geoscience, most exercises that ask you to construct a best-fit line have to do with wanting to be able recognize relationships among variables on Earth or to predict the behavior of a system (in this case the Earth system).
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