Exercise

# The usefulness of higher order terms

Which one of the following statements is true with respect to `model_1`

, `model_2`

and `model_3`

? All three models are saved and might be loaded from the workspace.

Instructions

**50 XP**

##### Possible Answers

- The inclusion of one higher order term significantly improves the fit, the inclusion of two higher order terms does not significantly improve the fit. A non-linear model with one higher order term is preferred.
- The inclusion of one higher order term significantly improves the fit, and the inclusion of two higher order terms significantly improves the fit. A non-linear model with two higher order terms is preferred.
- The inclusion of one higher order term does not significantly improve the fit, the inclusion of two higher order terms does significantly improve the fit. A non-linear model with two higher order terms is preferred.
- The inclusion of one higher order term does not significantly improve the fit, and the inclusion of two higher order terms does not significantly improve the fit. A linear model is preferred.