Train/test data leakage — find the bug — Data Science Applied

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Task

📝 **Task:** Fix the leakage bug. Fit scaling params on `X_train` only, then apply them to both splits.

📋 Implement the function above. Tests run automatically.

💡 **Hint:** Re-read the theory if you get stuck.

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📊write

Cohen's d — effect size

📊quiz

Loading a CSV

📊quiz

Selecting columns and rows

🤖predictFREE

Prerequisites — what you should know before this track

⚡predictFREE

Prerequisites — what you should know before this track

✏️ Write your code here

🐍

Loading Python...

First visit only — ~5-10s. Stays cached afterward.

📊 Result

Press Run to see result...

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💬 Discussion