Rafael Alvarez , the management accountant at Wyatt Manufacturing, is reviewing defective products from the most recent batch of the plant's complex signature product, SB171. The product is produced across different machines in the factory and has a defect rate of %. Workers' experience (measured in years) and the level of machine automation (measured on an interval scale from 0 to 5) varies across these machines and hypothesizes that these two factors contribute to defects. produced units of which are defective ( = ). selects the records of the defective units and randomly selected good units to build a training set of observations. He then builds a decision tree using this dataset