concepts:
  - id: descriptive-statistics
    title: Descriptive Statistics
    prerequisites: []
    mastery_signals:
      - explain mean, median, variance, and standard deviation
      - choose an appropriate descriptive summary for a dataset
  - id: probability
    title: Probability
    prerequisites:
      - descriptive-statistics
    mastery_signals:
      - explain conditional probability
      - compute simple event probabilities