Author note — to cover

Draw and interpret vertical line charts for ungrouped discrete numerical data, with the numerical axis making the mode and range visible. Contrast with bar charts: lines not bars because the horizontal axis is numerical. Grouped or continuous data is out of scope here and needs polygons or histograms instead. Both tiers. (S2)

• Fluency — direct questions on vertical line charts, 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).