In decision tree analysis, which of the following metrics is most appropriate for evaluating the quality of a split when dealing with continuous target variables? (difficulty: medium)

When normalizing a sales database, which scenario represents a transitive dependency that violates Third Normal Form (3NF)? (difficulty: hard)

In sales funnel analysis, which metric best indicates the efficiency of your sales process when comparing the performance of different months? (difficulty: hard)

In capacity planning, what does a steady increase in the ratio of peak-to-average demand over historical periods typically indicate? (difficulty: hard)

A company's sales data has a mean absolute percentage error (MAPE) of 15% using simple exponential smoothing and 8% using double exponential smoothing. What can be concluded about the nature of the data? (difficulty: hard)