Short Answer

What happens when a model has both high bias and high variance?

Question: For a supervised learning model that has both high bias and high variance, how does its performance compare on the training data and the validation data?

Sample answer: It fits the training data badly and does even worse on the validation data.

Key points:

  • Training performance is poor.
  • Validation performance is poorer still.

Rubric: The answer should say that the model performs poorly on the training data and performs even worse on the validation data.

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Updated 2026-08-12

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