1. Pandas Merge vs Join
Question: What is the difference between merge and join in Pandas?
join is used to combine two DataFrames on the index or on a key column. merge is more versatile and allows you to specify columns to join on for both left and right DataFrames.
2. Overfitting vs Underfitting
Question: Explain overfitting and underfitting.
Overfitting: The model learns the training data too well, including noise, and performs poorly on new data. High variance.
Underfitting: The model is too simple to capture the underlying pattern of the data. High bias.