Relationships between variables

Graphs and numerical summaries

• Scatterplots (quantitative variables):
  • Scatterplot with correlation coefficient, regression line, and residual plot
  • Scatterplot of two quantitative variables and a third categorical variable (includes option for including regression lines)
  • Evaluating the effect of specific points
• Relationships between categorical variables
  • Graph one conditional or marginal distribution
  • Graphically compare two or more conditional distributions of the explanatory variable for the different values of the response variable

Numerical summaries

• Regression line (quantitative variables)
  • Illustration of computing regression coefficients by hand, when given the correlation coefficient and the means and standard deviations
• Coefficient of determination (r-squared)
  • Graph to illustrate the coeff. of determination with total variation and explained variation
• Two-way tables (categorical variables)
  • Compute specific values (proportions/percentages) in a conditional, marginal, or joint distribution 

  
  

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