DMC Study Guide 2026
Everything you need to pass the DMC exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 DMC Exam Format at a Glance
📚 DMC Topics to Study (27)
✍️ Sample DMC Questions & Answers
1. Which OLAP operation moves from summarized data to more detailed data?
Drilling down moves from higher-level summaries to more detailed data — for example, from annual sales totals down to individual daily transactions.
2. A model fails to train because of NaN values in numeric features. Which is an appropriate first step?
Missing values must be handled with a method suited to the missingness pattern before training.
3. Why is min-max normalization sensitive to outliers?
Because min and max define the scale, one extreme point squeezes the remaining values into a narrow interval.
4. Which measure of central tendency is LEAST affected by extreme outliers?
The median is least affected by outliers because it represents the positional middle value, not influenced by extreme values on either end.
5. In k-means clustering, what happens to the within-cluster sum of squares (WCSS) as k increases?
More centroids can only reduce or maintain WCSS, reaching zero when each point is its own cluster, which is why the elbow method looks for diminishing returns.
6. A clustering result places one huge cluster and many tiny ones. Which action is the most reasonable to try?
Scaling, k selection, and algorithm suitability all affect cluster balance and shape.
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