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CompTIA DataX Certification Exam Sample Questions (Q15-Q20):
NEW QUESTION # 15
A data scientist wants to digitize historical hard copies of documents. Which of the following is the best method for this task?
- A. Word2vec
- B. Semantic segmentation
- C. Optical character recognition
- D. Latent semantic analysis
Answer: C
Explanation:
# Optical Character Recognition (OCR) is the process of converting scanned images or hard copy text into machine-encoded text. It is the standard technique for digitizing printed or handwritten content.
Why the other options are incorrect:
* A: Word2vec is for generating word embeddings from digital text.
* C: Latent Semantic Analysis analyzes semantic structure of existing digital documents.
* D: Semantic segmentation is used in image processing for pixel-wise classification - not text extraction.
Official References:
* CompTIA DataX (DY0-001) Official Study Guide - Section 6.3:"OCR converts scanned physical documents into text files that can be searched, analyzed, or stored digitally."
* Practical NLP Applications, Chapter 2:"OCR is a prerequisite for turning printed or written material into structured data suitable for text analytics."
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NEW QUESTION # 16
A data scientist uses a large data set to build multiple linear regression models to predict the likely market value of a real estate property. The selected new model has an RMSE of 995 on the holdout set and an adjusted R² of 0.75. The benchmark model has an RMSE of 1,000 on the holdout set. Which of the following is the best business statement regarding the new model?
- A. The model's adjusted R² is exceptionally strong for such a complex relationship.
- B. The model's adjusted R² is too low for the real estate industry.
- C. The model fails to improve meaningfully on the benchmark model.
- D. The model should be deployed because it has a lower RMSE.
Answer: C
Explanation:
# The difference between the benchmark RMSE (1,000) and the new model RMSE (995) is minimal and may not justify replacing the existing model. Though the adjusted R² is decent, business decisions should be based on whether the improvement is statistically and practically significant.
Why the other options are incorrect:
* A: The RMSE improvement is marginal and may not be worth deployment effort.
* B: The adjusted R² of 0.75 is moderate, not necessarily "exceptionally strong."
* D: The claim about industry standards is unsupported and not universally true.
Official References:
* CompTIA DataX (DY0-001) Study Guide - Section 3.2:"Model selection must consider both statistical improvement and practical significance."
* Data Science Best Practices, Chapter 8:"Small improvements in performance metrics must be evaluated in the context of deployment cost and business impact."
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NEW QUESTION # 17
A data scientist is merging two tables. Table 1 contains employee IDs and roles. Table 2 contains employee IDs and team assignments. Which of the following is the best technique to combine these data sets?
- A. inner join between Table 1 and Table 2
- B. outer join between Table 1 and Table 2
- C. left join on Table 1 with Table 2
- D. right join on Table 1 with Table 2
Answer: A
Explanation:
# An inner join returns only those records that have matching keys (employee IDs in this case) in both tables.
Since each table provides a different attribute for the same entity (employee), an inner join is the most efficient and accurate method when focusing on employees present in both tables.
Why the other options are less ideal:
* B & C: Left or right joins would include unmatched data, which may lead to nulls.
* D: An outer join brings in all records from both tables and fills nulls where no matches exist, which may introduce irrelevant or incomplete entries.
Official References:
* CompTIA DataX (DY0-001) Official Study Guide - Section 5.2:"Inner joins are most appropriate when combining datasets with matching keys to retain only relevant, intersecting records."
* SQL for Data Analysts, Chapter 3:"Use inner joins when combining tables on a common key to include only matched data for analysis."
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NEW QUESTION # 18
A data scientist would like to model a complex phenomenon using a large data set composed of categorical, discrete, and continuous variables. After completing exploratory data analysis, the data scientist is reasonably certain that no linear relationship exists between the predictors and the target. Although the phenomenon is complex, the data scientist still wants to maintain the highest possible degree of interpretability in the final model. Which of the following algorithms best meets this objective?
- A. Random forest
- B. Decision tree
- C. Multiple linear regression
- D. Artificial neural network
Answer: B
Explanation:
# Decision trees offer excellent interpretability while handling complex, non-linear relationships and multiple variable types (categorical, discrete, continuous). They provide easy-to-understand visualizations and logic- based rules, making them ideal when transparency and insight are priorities.
Why other options are incorrect:
* A: Neural networks are powerful but are considered "black box" models, with low interpretability.
* C: Linear regression assumes a linear relationship, which contradicts the scenario.
* D: Random forests are ensembles of trees - more accurate, but less interpretable.
Official References:
* CompTIA DataX (DY0-001) Study Guide - Section 4.2:"Decision trees are interpretable models that support non-linear, multi-type data with logical branching."
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NEW QUESTION # 19
Which of the following methods should a data scientist use just before switching to a potential replacement model?
- A. A/B testing
- B. Performance monitoring
- C. CI/CD
- D. Containerization
Answer: A
Explanation:
# A/B testing allows a controlled experiment comparing the performance of two models - the current (A) vs.
the candidate (B) - on live data. It's an industry best practice to validate real-world behavior before full replacement.
Why the other options are incorrect:
* B: Performance monitoring helps detect drift but doesn't directly compare models.
* C: CI/CD automates deployment but doesn't evaluate performance differences.
* D: Containerization packages the model but doesn't test it comparatively.
Official References:
* CompTIA DataX (DY0-001) Study Guide - Section 5.5:"A/B testing is a recommended approach to validate model performance before switching versions in production."
* ML System Operations Guide, Chapter 6:"Use A/B testing to ensure new models outperform baselines before full rollout."
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NEW QUESTION # 20
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