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One of these challenges asks you a polynomial regression model, whereas the second one asks you for multiple linear model, so if you used the polynomial model (especially this of an other case), this very likely led to overfitting.
Test different models on the sample input and decide on the most proper one, obviously a linear model here.
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Day 6: Multiple Linear Regression: Predicting House Prices
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One of these challenges asks you a polynomial regression model, whereas the second one asks you for multiple linear model, so if you used the polynomial model (especially this of an other case), this very likely led to overfitting. Test different models on the sample input and decide on the most proper one, obviously a linear model here.