COMPTIA DY0-001 DUMPS - PASS EXAM WITH EASE [2025]

CompTIA DY0-001 Dumps - Pass Exam With Ease [2025]

CompTIA DY0-001 Dumps - Pass Exam With Ease [2025]

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CompTIA DataX Certification Exam Sample Questions (Q74-Q79):

NEW QUESTION # 74
A data scientist is building a model to predict customer credit scores based on information collected from reporting agencies. The model needs to automatically adjust its parameters to adapt to recent changes in the information collected. Which of the following is the best model to use?

  • A. XGBoost
  • B. Decision tree
  • C. Linear discriminant analysis
  • D. Random forest

Answer: A

Explanation:
# XGBoost (Extreme Gradient Boosting) is a high-performance, scalable ensemble algorithm that builds decision trees in sequence and adjusts to errors iteratively. It also supports incremental training, making it adaptive to changing data patterns - ideal for dynamically updated credit information.
Why the other options are incorrect:
* A: Decision trees are static once trained and don't adapt unless retrained.
* B: Random forest is an ensemble of trees but lacks the adaptive boosting component.
* C: LDA is a linear classification technique - not suited for adapting to changing data distributions.
Official References:
* CompTIA DataX (DY0-001) Official Study Guide - Section 4.3:"XGBoost is highly efficient and supports iterative learning, making it well-suited for data environments that evolve over time."
* Applied Machine Learning Guide, Chapter 8:"XGBoost adapts to changes by refining errors across iterations, providing robustness in dynamic systems."
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NEW QUESTION # 75
Which of the following issues should a data scientist be most concerned about when generating a synthetic data set?

  • A. The data set having insufficient features
  • B. The data set not being representative of the population
  • C. The data set consuming too many resources
  • D. The data set having insufficient row observations

Answer: B

Explanation:
# When generating synthetic data, the key concern is ensuring it accurately reflects the characteristics of the real-world population. A non-representative synthetic dataset may lead to biased models and invalid conclusions.
Why the other options are incorrect:
* A: Resource usage is a technical concern but not as critical as representativeness.
* B: Feature set can often be replicated or engineered - quality matters more.
* C: Synthetic datasets can be scaled up easily - representativeness is harder to validate.
Official References:
* CompTIA DataX (DY0-001) Study Guide - Section 5.4:"Synthetic data must maintain representational fidelity to the original population in order to be useful for modeling or validation."
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NEW QUESTION # 76
A team is building a spam detection system. The team wants a probability-based identification method without complex, in-depth training from the historical data set. Which of the following methods would best serve this purpose?

  • A. Linear regression
  • B. Logistic regression
  • C. Naive Bayes
  • D. Random forest

Answer: C

Explanation:
# Naive Bayes is a probabilistic classification algorithm based on Bayes' theorem. It is lightweight, fast, and effective for text-based classification problems like spam detection. It also performs well with small or simple training sets.
Why the other options are incorrect:
* A: Logistic regression is also probabilistic but requires more feature preprocessing.
* B: Random forest is accurate but computationally heavier.
* D: Linear regression is for continuous targets - not suitable for classification.
Official References:
* CompTIA DataX (DY0-001) Study Guide - Section 4.1:"Naive Bayes classifiers are ideal for spam detection and similar applications due to their efficiency and probabilistic nature."
* Text Classification Techniques, Chapter 4:"Naive Bayes requires minimal training and works well with high-dimensional, sparse data such as email content."


NEW QUESTION # 77
A data scientist is developing a model to predict the outcome of a vote for a national mascot. The choice is between tigers and lions. The full data set represents feedback from individuals representing 17 professions and 12 different locations. The following rank aggregation represents 80% of the data set:

(Screenshot shows survey rankings for just two professions and a few locations, all voting for "Tigers") Which of the following is the most likely concern about the model's ability to predict the outcome of the vote?

  • A. Extrapolated data
  • B. In-sample data
  • C. Interpolated data
  • D. Out-of-sample data

Answer: A

Explanation:
# Extrapolated data refers to making predictions about data points that fall outside the observed range or distribution. Since the sample data (80%) is heavily skewed toward a small subset of professions and locations, predicting results for the remaining, unrepresented professions and regions involves extrapolation.
Why the other options are incorrect:
* A: Interpolation occurs within the bounds of observed data - not the issue here.
* C: In-sample data refers to training data, which is overrepresented in this case.
* D: Out-of-sample data is a concern in generalization but extrapolation is more specific here.
Official References:
* CompTIA DataX (DY0-001) Study Guide - Section 3.2:"Extrapolation introduces risk when models are used outside the range of data they were trained on, especially if certain subgroups are underrepresented."
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NEW QUESTION # 78
Which of the following distance metrics for KNN is best described as a straight line?

  • A. Euclidean
  • B. Cosine
  • C. Radial
  • D. Manhattan

Answer: A

Explanation:
# Euclidean distance is the most intuitive distance metric. It measures the shortest "straight-line" distance between two points in Euclidean space. This is typically used in KNN and clustering when features are continuous and appropriately scaled.
Why the other options are incorrect:
* A: "Radial" isn't a standard distance metric; may refer vaguely to radial basis functions.
* C: Cosine measures the angle (orientation) between vectors - not straight-line distance.
* D: Manhattan distance sums the absolute differences across dimensions - visualized as block-like (taxicab) paths, not direct lines.
Official References:
* CompTIA DataX (DY0-001) Study Guide - Section 4.4:"Euclidean distance is the default metric in KNN for measuring straight-line proximity in feature space."
* Data Mining Techniques, Chapter 3:"Euclidean distance represents the shortest path between two points and is widely used in distance-based learning algorithms."
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NEW QUESTION # 79
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