5-7: Scatter Plots & Lines of Best Fit. What is a scatter plot? A graph in which two sets of data...
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5-7: Scatter Plots & Lines of Best Fit
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Transcript of 5-7: Scatter Plots & Lines of Best Fit. What is a scatter plot? A graph in which two sets of data...
5-7: Scatter Plots5-7: Scatter Plots
& Lines of Best Fit & Lines of Best Fit
What is a scatter plot?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.
When we look at relationships of x and y…
When we look at relationships of x and y…
There are 3 possibilitiesPositive Correlation Negative CorrelationNo Correlation
There are 3 possibilitiesPositive Correlation Negative CorrelationNo Correlation
Positive Correlation Positive Correlation
As x increases, y increases Has a positive slope.
As x increases, y increases Has a positive slope.
QuickTime™ and a decompressor
are needed to see this picture.
Negative Correlation Negative Correlation
As x increases, y decreases Has a negative slope.
As x increases, y decreases Has a negative slope.
QuickTime™ and a decompressor
are needed to see this picture.
NO Correlation NO Correlation
No relationship between x and y. No relationship between x and y.
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are needed to see this picture.
Lines of Best FitLines 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.
QuickTime™ and a decompressor
are needed to see this picture.
Finding Equations of Lines of Best Fit
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)
Let’s Do It!Let’s Do It!
Close your laptop and plot the data on
the notesheet.
Close your laptop and plot the data on
the notesheet.
