Which alarm mistakes matter in this situation?
Write a fictional scenario, assign costs before testing, and defend the threshold with per-case evidence.
Use the threshold to classify each case. Sum FP cost and FN cost separately, then compare alternatives.
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.
Score: 0.2
Actual event: False
My prediction and reason:
Score: 0.4
Actual event: True
My prediction and reason:
Score: 0.6
Actual event: False
My prediction and reason:
Score: 0.8
Actual event: True
My prediction and reason:
Costs are scenario assumptions chosen before evaluation, not objective values of people.