The uncertain recycling gate

Which mistakes does your recycling rule make?

Make your own investigation

Create an awkward object near the boundary. Compare two rules and name the mistake each accepts.

Classify scores at or above the boundary as positive. Compare each decision with its known label.

Case cards

Cut these cards apart. Use the original example first, then let a partner supply a changed case. Keep sealed/final cards with the teacher until the learner commits a rule.

Case 1

Object score: 0.2

Actually recyclable: False

My prediction and reason:

Case 2

Object score: 0.48

Actually recyclable: True

My prediction and reason:

Case 3

Object score: 0.51

Actually recyclable: False

My prediction and reason:

Case 4

Object score: 0.8

Actually recyclable: True

My prediction and reason:

Case 5

Object score: 0.9

Actually recyclable: True

My prediction and reason:

What this cannot establish

Scores and objects are synthetic; a threshold cannot remove overlapping groups.