Author note — to cover

Classify described variables as qualitative (categorical) or quantitative (numerical), and explain how the type fixes which charts and averages are valid, mode only for categories. Classification and short-justification questions. Discrete versus continuous is the sibling page; primary versus secondary is another. Both tiers. (S2, S4)

• Fluency — direct questions on qualitative and quantitative data, limited to this lesson's stated scope (4 questions).
• Application — use the same skill in unfamiliar or contextual questions without introducing a later method (4 questions).
• Check — questions built around the exclusions and likely misconceptions named in the lesson brief (4 questions).