Mean absolute deviation

Target: Compute a mean absolute deviation for a symmetric set.

Language target: Describe MAD as a typical distance from the mean.

Likely miss: Students report the range as the mean absolute deviation.

Ask: Is that the farthest gap, or a typical distance?

If you see it: Find the mean, then the average distance from that mean.

Evidence to listen for: The student distinguishes range from average distance.

Next: If the farthest gap is used, compute one deviation at a time.

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.