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

Apply a CART model for predicting churn. Use default misclassification costs. Determine the following measures.
a. Proportion of false positives.
b. Proportion of false negatives.
c. Overall error rate.
d. Overall model accuracy (1 – overall error rate).
e. Sensitivity
f. Specificity