Today's Class Recap:

• Stamp = first/top two chapter 8 slides
• Back to chapter 8 notes...
• Discussed residuals and took notes
• How do we calculate a residual? 
• What is a residual? What does it measure?
• What does the negative/positive sign of a residual tell us?
• How can we interpret a residual, in context?
• How can we draw residuals on a graph?
• Started to explore/discuss what we mean by "best fit"
• Review: Check out the "AP Stat Guy" videos for help interpreting slope and y intercept!
• Interpreting Slope (Click me!)
• Interpreting Y Intercept (Click me!)

Tuesday HW: The following assignment will be checked on tomorrow!

Page 189-197: *Skip both questions about interpreting R^2, we'll learn this tomorrow*

• 41 (find r, interpret R^2, write equation, interpret slope/intercept, is a linear model appropriate)
• 41f: This question asks if there is "evidence of a violation of any assumptions behind the regression..." 
• In other words, remember we identified 4 conditions to determine "if a linear model is appropriate:--this question (f) is asking you to decide if any of these 4 conditions has not been met
• 4 Conditions: scatterplot is roughly linear, no outliers in the scatterplot (nothing crazy--there aren't any here),  both variables are quantitative, and the residual plot should not have a pattern (we'll discuss why moving forward)
• 47 (describe association, write equation, interpret slope/yint, interpret residual, predict, interpret R^2)

Bonus Stamp Opportunity (up to 3 stamps): look up what we mean by "best fit!" Then, try to re-write this in your own words, in your notes! I'll come look tomorrow when I check homework!

• If you copy the definition and do not paraphrase/put it in your own words = 1 stamp
• Copy the definition AND translate this definition into your "own words" = 3 stamps

Tomorrow in class we'll discuss what "best fit" means; then, we'll  look at the meaning of R^2 with the AP Stat Guy, and we'll finish up with some AP MC if we have time!

Oh, and if you're looking to get  head start--this will be our weekend HW (we'll have a different homework assigned tomorrow to be collected Friday):

• 15 (is a linear model appropriate and interpret R^2)
• 19 (write equation, predict, interpret slope, interpret intercept, use residual)
• 35bcdefg (interpret R^2, find LSRL equation, is a linear model appropriate and create residual plot, interpret slope and y intercept, use residual)