Introductory Statistics 2e IV — Relationships and Group Comparisons

The final course adapted from OpenStax Introductory Statistics 2e, connecting chi-square comparisons, scatterplots, correlation, least-squares regression, residual diagnostics, and one-way ANOVA to responsible interpretation.

3 sections · 8 lessons

Course outline

Categorical Patterns

  1. Compare Counts with Expectations
  2. One Table, Two Sampling Questions

Lines Need Diagnostics

  1. Correlation Sees Only Linear Pattern
  2. Least Squares Fits Vertical Errors
  3. Residuals Judge the Model
  4. Evidence Does Not License Extrapolation
  5. Audit a Predictive Claim

Several Means, One Test

  1. ANOVA Compares Signal with Noise
  2. ANOVA Conclusions Need Assumptions
  3. Compare Three Training Programs

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