Q1. [2] § Test Yourself § Assertion and reasoning-based questions
Draw the confusion matrix for the following data :
- (a) The number of true positive = 200
- (b) The number of true negative = 50
- (c) The number of false positive = 35
- (d) The number of false negative = 55
Previously asked in CBSE board exam
2025 104/S Q15
Generated by claude-sonnet-4-6 · 2026-06-21 03:19 · grounding rag
Model Answer
Confusion Matrix:
| | Predicted Positive | Predicted Negative |
|---|---|---|
| Actual Positive | TP = 200 | FN = 55 |
| Actual Negative | FP = 35 | TN = 50 |
- Total predictions = 200 + 50 + 35 + 55 = 340
Source: Evaluation metrics for Classification, Chapter 3
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Explanation
- The confusion matrix is a 2×2 table with Actual values on rows and Predicted values on columns.
- Place TP and TN on the diagonal (correct predictions); FP and FN off-diagonal (wrong predictions).
- Examiners expect the correct placement: TP (top-left), FN (top-right), FP (bottom-left), TN (bottom-right).
- Mentioning total is optional but shows understanding.
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