Box plots and IQR

Target: Find the interquartile range from a five-number summary.

Language target: Point to the box rather than the whiskers.

Likely miss: Students subtract the minimum from the maximum and call it the IQR.

Ask: Which two numbers form the box?

If you see it: IQR is Q3 minus Q1, the length of the box.

Evidence to listen for: The student points to the box, not the whole whisker span.

Next: If the range appears, cover the whiskers and look only at the box.

Homework mark for this device

Until a teacher sets it here, family practice is optional. Stars are an incentive, not a grade. This setting is local. It is not a district roster.

unset optional required incentive

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