Statistical Methods Examples

Math 222 - Spring 2026

• Examples
• Main
• Notes
• Tools

Graphics

• Basic plots with R

• Fancier plots with ggplot2

• Quantile-quantile plots

Inference with R

• Confidence intervals for proportions (Rmd, html)

• Inference for two proportions (source)

• Chi-squared test for association

• Chi-squared test for goodness of fit

• Two sample t-test

• Log transform of quantitative data

• One-way ANOVA

• ANOVA: Pairwise Comparisons

• Linear regression: Beers versus BAC

• Linear regression: Midterm exams

• Linear regression confidence & prediction intervals

• Multi-linear regression slides

• Multi-linear regression slides 2: variable selection

• Logistic regression: Predicting calculus success