Appex 8

STA 112 - Spring 2024

  1. Create a new project from this template in RStudio Pro:
https://github.com/sta-112-s24/appex-08.git
  1. Load the packages and data by running the top chunk of R code
  2. Learn about the USstamps data by running ?USstamps in your Console
  3. Use the filter function to remove observations with Year less than 1958
  4. Fit a linear model predicting the stamp price from year
  5. Calculate the studentized residuals and plot them – are there any outliers?
  6. If you found an outlier, refit the model without it – is this point “influential”?