Presentation on theme: "Sec 1.5 Scatter Plots and Least Squares Lines Come in & plot your height (x-axis) and shoe size (y-axis) on the graph. Add your coordinate point to the."— Presentation transcript:
Sec 1.5 Scatter Plots and Least Squares Lines Come in & plot your height (x-axis) and shoe size (y-axis) on the graph. Add your coordinate point to the table! xy xy
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?