Application Exercise

You may use any notes, lectures, or your textbook. Do not work with anyone else on this assessment.

1. Open Rstudio Server Pro
2. Create a new project
3. Click File > New File > R Markdown
4. Delete everything except for

---
title: "Untitled"
output: html_document
---

5. Give your work a sensible title
6. When you’ve finished, upload the .html file to Canvas

Using the cheddar data from the faraway package, run the code below to add a time variable.

library(faraway)
cheddar$time <- 1:nrow(cheddar)

• Fit a linear model predicting taste from Acetic, H2S and Lactic.
• Plot the residuals from the model against time. What do you see?
• Fit a GLS model using AR(1) correlation. Is there evidence of correlation between the errors?