2/4/2026

Questions on R demonstration from last time

• See Kids198.R script for a variety of new commands
  

See GoogleDrive\Stat206-DataAnalysis-S2026\2ePowerPoint\Sec3.2R

• More on Multiple Regression
  • Inference for multiple regression
  • Partitioning Variability
  • Adjusted R-squared
  • Confidence intervals for a mean response
  • Prediction intervals for a new response

See GoogleDrive\Stat206-DataAnalysis-S2026\2ePowerPoint\See Sec3.3R

• Comparing two regression lines
  • Fitting separate regression lines (for different levels of a group variable)
  • Indicator variables
  • Comparing intercepts
  • Comparing slopes
  • Nested F-test

R Demonstration

• See GoogleDrive\Stat206-DataAnalysis-S2026\2eMarkkdown\Sec3.2.Rmd
• See GoogleDrive\Stat206-DataAnalysis-S2026\2eMarkkdown\Sec3.3.Rmd

In class exercises

• 3.44 on p. 150 (see MDs-Ex3-31.R)
• 3.13, 3.20, 3.22
• Exercise 3.32 on p. 147

Reminder: Quiz #1 will be given in class on Friday and it will cover Chapters 0, 1, and 2. You may use up to three 8.5"x11" sheets of notes, our course webpage, and an R script or R Markdown file that you can create during the quiz.

Please read Sections 3.4, 3.5, and 3.6 for class on Monday.