Appex 06

STA 112 - Fall 2023

Part 1

1. Go to lucy.shinyapps.io/least-squares/
2. This shows a scatter plot of 10 data points with a line estimating the relationship between x and y. Drag the blue points to change the line.
3. See if you can find a line that minimizes the sum of square errors

Part 2

1. Create a new project from this template in RStudio Pro:

https://github.com/sta-112-f23/appex-06.git

2. Load the packages and data by running the top chunk of R code
3. Learn about the PorschePrice data by running ?PorschePrice in your Console
4. Fit a linear model predicting Price from Mileage
5. Add a variable called y_hat to the PorschePrice dataset with the predicted y values
6. Add a variable called residual to the PorschePrice dataset with the residuals