The production of wine is a multibillion-dollar worldwide industry. In an attempt to develop a model of wine quality as judged by wine experts, data were collected from red and white wine
variants of Portuguese “Vinho Verde” wine.

Source: Data extracted from P. Cortez et. al., “Modeling Wine Preferences by Data Mining from Physiochemical Properties,” Decision Support Systems, 47, 2009, pp. 547–553 and bit.ly/9xKlEa.

The population of 6,497 wines is stored in VinhoVerde Population.

a. Using half the data as the training sample and the other half of the data as the validation sample, develop a classification tree model to predict the probability that the wine is red. (Consider the entire set of variables in your analysis.)

b. What conclusions can you reach about the probability that the wine is red.