Histograms

Target: Read frequencies from bar heights.

Language target: Distinguish a bar from an observation.

Likely miss: Students count the bars instead of the observations.

Ask: What does the height of one bar tell you?

If you see it: Each bar’s height is a frequency. Add the frequencies to count observations.

Evidence to listen for: The student uses frequencies, not the number of bars.

Next: If the answer is the number of intervals, return to one bar and its count.

Observable student moves: names both quantities, uses the represented relationship, and revises after feedback. This companion is not a score.