1. Do Now
Get a chromebook (share with a partner or group of 3)
Go to website posted on google classroom.

2. Complete #4cd from homework

3. Lesson 3.2 Day 4
Outliers and the LSRL

4. Objectives
Describe how the least-squares regression line, standard deviation of the residuals, and 𝑟 2  are influenced by outliers.
Find the slope and y intercept of the least-squares regression line from the means and standard deviations of x and y and their correlation.

5. Stapplet Activity
Work with a partner on one chromebook

6. The horizontal and vertical lines in the applet are not the x- axis and y-axis.  
They are the values which represent the mean of all the x values and the mean of all the y values.  So the crosshair of the two lines is the point (mean of x, mean of y).

7. Pro tip
To remove a point on the applet, simply click on it a second time and it will disappear.

8. Big Ideas A good LSRL has a Low s (standard deviation of residuals)
High r 2 (coefficient of determination)

9. LSRL
𝑦 = 𝑏 0 + 𝑏 1 𝑥 𝑏 1 =𝑟 𝑠 𝑦 𝑠 𝑥 𝑏 0 = 𝑦 − 𝑏 1 𝑥

10. Check your understanding