In a decision tree, the first predictive independent variable is represented __________.

• A. at the top
• B. in the middle
• C. at the bottom
• D. on the side

Answer: (A)

In a decision tree, the initial split is placed at the top as the root node. This root node represents the first decision made when traversing the tree and uses the most informative predictor to separate the data. From there, the tree grows downward with subsequent splits, each branch representing further decisions. The top position communicates that this is the starting point of the decision process, while leaves end at the bottom.