Scatter Plot and Line of Best Fit
Videos, worksheets, stories and songs to help Grade 8 students learn about Scatter Plots, Line of Best Fit and Correlation.
A scatter plot or scatter diagram is a two-dimensional graph in which the points corresponding to two related factors are graphed and observed for correlation. A downward trend in points shows a negative correlation. An upward trend in points shows a positive correlation. If there is no trend in graph points then there is no correlation.
Scatter Plot
In this video, you will learn that a scatter plot is a graph in which the data is plotted as points on a coordinate grid, and note that a "best-fit line" can be drawn to determine the trend in the data. If the x-values increase as the y-values increase, the scatter plot represents a positive correlation. If the x-values increase as the y-values decrease, the scatter plot represents a negative correlation. If the data is spread out so that it is not possible to draw a "best-fit line", there is no correlation.
Scatter Plots : Introduction to Positive and Negative Correlation.
Starts with a description of how to plot a scatterplot from a table. At the 2:24 mark it talks about how to interpret scatterplots in terms of direction, form, strength and outliers.
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