Question: Now construct a CART model to predict letter using the training data. Again, select the ccp alpha value for the tree through cross-validation. Again, explain

Now construct a CART model to predict letter using the training data. Again, select the ccp alpha value for the tree through cross-validation. Again, explain how you did the cross-validation and how you selected the ccp alpha value. What is the test set accuracy of your CART model

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