Question: 3. Now, attempt to improve the predictive accuracy of the income prediction model by using the extreme gradient boosting approach. This time, instead of explicitly

3. Now, attempt to improve the predictive accuracy of the income prediction model by using the extreme gradient boosting approach. This time, instead of explicitly setting the tuning parameters, have caret evaluate two values per hyperparameter in order to select the combination that provides the best predictive accuracy. What improvement in predictive accuracy were you able to achieve?

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