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5-7: Scatter Plots & Lines of Best Fit

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What is a scatter plot? A graph in which two sets of data are plotted as ordered pairs When looking at the graph you can see the relationship between the two variables. A graph in which two sets of data are plotted as ordered pairs When looking at the graph you can see the relationship between the two variables.

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When we look at relationships of x and y… There are 3 possibilities Positive Correlation Negative Correlation No Correlation There are 3 possibilities Positive Correlation Negative Correlation No Correlation

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Positive Correlation As x increases, y increases Has a positive slope. As x increases, y increases Has a positive slope.

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Negative Correlation As x increases, y decreases Has a negative slope. As x increases, y decreases Has a negative slope.

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NO Correlation No relationship between x and y.

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Lines of Best Fit A line which describes the trend of the data. You will determine the line of best fit, by sketching a line which passes through as many points as possible. A line which describes the trend of the data. You will determine the line of best fit, by sketching a line which passes through as many points as possible.

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Finding Equations of Lines of Best Fit 1)Plot the data 2)Sketch a line of best fit, passing through as many points as possible. 3)Choose 2 points on your line and find the equation of the line. a) find the slope b) Write the equation of the line in slope intercept form. (y = mx + b) 1)Plot the data 2)Sketch a line of best fit, passing through as many points as possible. 3)Choose 2 points on your line and find the equation of the line. a) find the slope b) Write the equation of the line in slope intercept form. (y = mx + b)

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Let’s Do It! Close your laptop and plot the data on the notesheet.

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