The CompTIA DY0-001 Exam Dumps In PDF File Format

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CompTIA DataAI Certification Exam Sample Questions (Q47-Q52):

NEW QUESTION # 47
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?

Answer: C

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 # 48
The term "greedy algorithms" refers to machine-learning algorithms that:

Answer: C

Explanation:
# Greedy algorithms make decisions based on what appears to be the best (most optimal) choice at that current moment - i.e., a locally optimal decision - without regard to whether this choice will yield the globally optimal solution.
Examples in machine learning:
* Decision Tree algorithms (e.g., CART) use greedy approaches by selecting the best split at each node based on information gain or Gini index.
Why the other options are incorrect:
* A: This refers to Bayesian updating, not greedy behavior.
* B: That describes exhaustive search, not greediness.
* C: That aligns more with probabilistic or generative models, not greedy strategies.
Official References:
* CompTIA DataX (DY0-001) Official Study Guide - Section 4.2 (Model Selection Methods):"Greedy algorithms make locally optimal decisions at each step. Decision trees, for instance, use greedy splitting based on current best criteria."
* Elements of Statistical Learning, Chapter 9:"Greedy methods make stepwise decisions that maximize immediate gains - they are fast, but may miss the global optimum."
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NEW QUESTION # 49
A data scientist is analyzing a data set with categorical features and would like to make those features more useful when building a model. Which of the following data transformation techniques should the data scientist use? (Choose two.)

Answer: E

Explanation:
One-hot encoding creates binary indicator columns for each category, allowing models to treat nominal categories without implying any order.
Label encoding maps categories to integer labels, which can be useful for tree-based models or when you need a single numeric column (though you must ensure the algorithm can handle treated ordinality appropriately).


NEW QUESTION # 50
A data scientist needs to analyze a company's chemical businesses and is using the master database of the conglomerate company. Nothing in the data differentiates the data observations for the different businesses. Which of the following is the most efficient way to identify the chemical businesses' observations?

Answer: C

Explanation:
Engaging the business team leverages domain expertise to pinpoint which records pertain to chemical operations, allowing you to extract and analyze just the relevant subset. This avoids the time and resource waste of ingesting and sifting through unrelated data.


NEW QUESTION # 51
Which of the following best describes the minimization of the residual term in a ridge linear regression?

Answer: B

Explanation:
Ridge regression extends ordinary least squares by adding an L2 penalty on the coefficients, but it still minimizes the sum of squared residuals (e²) as its loss term.


NEW QUESTION # 52
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