Sec 1.5 Scatter Plots and Least Squares Lines Come in & plot your height (x-axis) and shoe size...
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Transcript of Sec 1.5 Scatter Plots and Least Squares Lines Come in & plot your height (x-axis) and shoe size...
Sec 1.5 Scatter Plots and Least Squares LinesCome in & plot your height (x-axis) and shoe size (y-axis) on the graph. Add your coordinate point to the table!
x y x y
• Scatter plots are used to view the relationship between two variables.
• **In this case, ______________ and ______________.
• What kind of relationship do height and shoe size seem to have, if any?
• Using your graphing calculator make a scatter plot and find the equation of the line that best fits the data.
Y =
• What is the rate of change for height vs. shoe size and what does this tell us about height vs. shoe size?
• There is a correlation between two variables when there seems to be a line about which the data points cluster.
• There can be negative, positive or no correlation.
• How is height vs. shoe size correlated?
• There is a value that tells how closely the data points cluster around the least squares line. This value is called the correlation coefficient or r.
• What is the correlation coefficient, r? What does this mean about the relationship between height and shoe size?