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?