Python Idle
Your housing-price model looked great on one test split — R-squared of 0.82. But your senior colleague is skeptical: "That could be luck. What if you just got an easy test set?" She challenges you to prove the model is consistently good by running 5-fold cross-validation. One split is an anecdote; five folds is evidence.
~15 minscenario510 rows
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Goals: 4 tests
should produce exactly 5 cross-validation scores
mean CV score should be above 0.4
std_cv should be a float
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