DAC Study Guide 2026

Everything you need to pass the DAC 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.

📋 DAC Exam Format at a Glance

65
Questions
90 min
Time Limit
70.00%
Passing Score

📚 DAC Topics to Study (45)

✍️ Sample DAC Questions & Answers

1. Which metric summarizes model performance across all classification thresholds?
AUC-ROC

The AUC-ROC measures a classifier's ability to rank positives above negatives across every threshold.

2. A histogram is most useful for showing what about a single numeric variable?
Its distribution

Histograms group values into bins to reveal the shape of a distribution.

3. In Power BI or Tableau, what is the main benefit of drill-down functionality?
Letting users navigate from summary to detailed levels

Drill-down lets users move from aggregated summaries into finer detail.

4. What does standard deviation measure in a dataset?
The average distance of data points from the mean

Standard deviation quantifies how spread out the data values are around the mean — a larger value indicates more variability.

5. A report double-counts revenue because the same order appears twice. What cleaning step fixes this?
Deduplication

Deduplication removes repeated records so each entity is counted once.

6. What is 'data-ink ratio' as described by Edward Tufte?
The proportion of ink used to display actual data versus decoration

Data-ink ratio measures how much of a chart's ink represents real data versus non-essential decoration.

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📖 DAC Guides & Articles

Your DAC Study Path
1. Learn with Flashcards → 2. Drill Practice Tests → 3. Take the Full Exam Simulation