Exercise

# Evaluate a regression tree model

Predict the final grade for all students in the test set. The grade is on a 0-20 scale. Evaluate the model based on test set RMSE (Root Mean Squared Error). RMSE tells us approximately how far away our predictions are from the true values.

Instructions

**100 XP**

- First generate predictions on the
`grade_test`

data frame using the`grade_model`

object. - After generating test set predictions, use the
`rmse()`

function from the**Metrics**package to compute test set RMSE.