Numerical vs numerical

Scatter plots of the top feature pairs and against the target; add a trend line. Concepts: Scatter plots; linear vs non-linear trends; overplotting Project A: credit_amount vs duration_months coloured by target (r ≈ 0.62: bigger loans run longer); age vs credit_amount. Project B: Load vs national temperature: U-shape (heating in winter, cooling in summer) — a straight line would miss it.