Hump Day Homework

Tonight, please complete the following in your textbook;

Page 189: 3, 15a, 35d

• Remember, to determine if a linear model is appropriate, we need make sure our variables are quantitative; we also want to check a scatterplot to see if it's linear and/or has outliers; and today, we added the most important piece--we need to check a residual plot
• If there is no pattern in the residual plot (or the residual plot shows random scatter), then a linear model IS appropriate
• For 15a, the scatterplot and residual plot and context are provided! Check these!
• Your answer should read as follows (this is practice for a quiz!)
• "A linear model is/is not appropriate because....
• _______ and __________ are/are not quantitative
• The scatterplot is/is not roughly linear.
• There are/are not outliers in the scatterplot
• The residual plot shows random scatter (then a linear model is appropriate), or the residual plot shows a pattern or fan shape (then a linear model is not appropriate)
• For 35d you need to check each of the things listed above (for 15a), but this time you have to create the scatterplot and residual plot yourself, with your calculator
• YOU MUST SKETCH BOTH! (If there are not two sketches on your homework--a scatterplot and a residual plot--you will not receive full credit).
• Look at the yellow box at the top of page 184 for help creating a scatterplot!

See you all tomorrow for a half day and more residuals!