Use the churn data set at the book series website for the following exercises. Make sure that the correlated variables have been accounted for.

Based on your answer to Exercise 2, adjust the misclassification costs for your CART model to reduce the prevalence of the more costly type of error. Rerun the CART algorithm. Compare the false positive, false negative, sensitivity, specificity, and overall error rate with the previous model. Discuss the trade-off between the various rates in terms of cost for the company.