4.5 - Scatter Plots

• Scatter plot: a graph with points plotted to show a relationship between 2 sets of data

• Correlations: describes relationships between 2 sets of data

• Positive Correlation: both data sets increase

• Negative Correlation: one set increases while the other decreases

• No Correlation: No relationship

• Trend Line (Line of best fit): Shows correlation between the data sets

​Example of a scatter plot

Bivariate data consist of two variables or two numerical observations. A scatter plot is a graph that shows the relationship between bivariate data. The data is graphed as ordered pairs on the coordinate plane. Once variable or value, does not necessarily depend on the other variable or value.

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​Association/Pattern

To show the overall trend of a data set, we can use a ​Line of Best Fit.

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A line of best fit should:

• Follow the trend of the data

• Split the data in half

• Help to estimate or predict values that are not already given in the set.

Line of Best Fit

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Scatter Plots can be described as linear and non-linear models. They are not perfectly linear or non-linear but they​ follow a trend.

Linear vs. Non-linear Models

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