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Grade 10 · lesson 3 of 4

Separate a Prediction from the Decision Policy

Apply the documented action policy rather than treating a score as an automatic real-world verdict.

About 22 minutes, plus any extended practice

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Supplied materials

  • Paper and pencil; answers may also be spoken or typed.
  • All cases, labels, numbers and rules are supplied on this page. No real account, private information or purchase is needed.

Learn the idea

A model output and the rule for acting on it are distinct. A decision policy can include thresholds, human review, abstention and appeal. A numerical score is not a guaranteed probability unless its meaning is established. Our fictional policy states the actions directly.

Contract: a valid score is a real number from 0 to 1 inclusive; reject anything outside that contract before using thresholds. For valid scores, score≥0.8 requires human review for action; 0.4≤score<0.8 holds for more evidence; score<0.4 does not act. A score is a supplied model output, not proof of a real-world result.

Use score 0.92: it is within [0,1], and 0.92≥0.8, so request human review. A score 1.3 is rejected first even though it exceeds 0.8. Show the validity check before the action band.

  1. Represent the supplied worked case with a labeled drawing, table or short trace.
  2. Apply the documented action policy rather than treating a score as an automatic real-world verdict.
  3. Explain why the worked answer fits and why one alternative does not.
  4. Try the new check and practice cases; revisit the stated rule if your evidence does not match.
Worked example

See the method in action

The score contract accepts real numbers from 0 to 1 inclusive. Score 0.92 passes that check and is at least 0.8, so it requires human review for action. Score 0.55 is valid but falls in [0.4,0.8), so hold for more evidence. Score 1.3 and score −0.2 are outside [0,1]; reject them before comparing action thresholds. A valid score and its documented action still do not prove a real-world outcome or bypass review.

Your turn

Check your reasoning

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Helpful tips
  • Apply the documented action policy rather than treating a score as an automatic real-world verdict.
  • Model confidence is not permission to bypass a stated human review step.
Score 0.6. Contract: a valid score is a real number from 0 to 1 inclusive; reject anything outside that contract before using thresholds. For valid scores, score≥0.8 requires human review for action; 0.4≤score<0.8 holds for more evidence; score<0.4 does not act. Choose the documented action.

Feedback appears here after you check. This is practice, not a graded school assessment.

See the answer and explanation

Hold for more evidence

Contract: a valid score is a real number from 0 to 1 inclusive; reject anything outside that contract before using thresholds. For valid scores, score≥0.8 requires human review for action; 0.4≤score<0.8 holds for more evidence; score<0.4 does not act. In Score 0.6, the value is valid, so apply its stated threshold band. The resulting action is Hold for more evidence. A score does not independently authorize action or prove a real-world outcome.

Take it further

Changed fictional policy keeps the real score contract 0≤score≤1 but raises the review threshold to 0.9. Lower valid scores are held. Expected: 0.85 is held; 0.95 requires human review; 1.2 is rejected before applying thresholds.

Nothing here is saved to an account or sent to a teacher. The answer download includes your current choice and any checked feedback. It does not include choices from the separate More practice section. Download that section separately.

More practice: try new cases

Choose an answer for each problem. Explain your method on paper, then use the feedback to decide what to revisit.

More practice: try new cases
1. Score 0.2. Contract: a valid score is a real number from 0 to 1 inclusive; reject anything outside that contract before using thresholds. For valid scores, score≥0.8 requires human review for action; 0.4≤score<0.8 holds for more evidence; score<0.4 does not act. Choose the documented action.
Need a hint?
  • Apply the documented action policy rather than treating a score as an automatic real-world verdict.
  • Model confidence is not permission to bypass a stated human review step.
2. Score 1.4. Contract: a valid score is a real number from 0 to 1 inclusive; reject anything outside that contract before using thresholds. For valid scores, score≥0.8 requires human review for action; 0.4≤score<0.8 holds for more evidence; score<0.4 does not act. Choose the documented action.
Need a hint?
  • Apply the documented action policy rather than treating a score as an automatic real-world verdict.
  • Model confidence is not permission to bypass a stated human review step.
3. Score 0.8. Contract: a valid score is a real number from 0 to 1 inclusive; reject anything outside that contract before using thresholds. For valid scores, score≥0.8 requires human review for action; 0.4≤score<0.8 holds for more evidence; score<0.4 does not act. Choose the documented action.
Need a hint?
  • Apply the documented action policy rather than treating a score as an automatic real-world verdict.
  • Model confidence is not permission to bypass a stated human review step.

Your choices are temporary. Feedback appears after you check all the answers.

Nothing here is saved to an account or sent to a teacher. Keep your own notes or download them before leaving. The score describes these questions; it does not certify subject mastery.

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