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[General] CompTIA DY0-001 Questions Are Designed By Experts

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【General】 CompTIA DY0-001 Questions Are Designed By Experts

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CompTIA DataX Certification Exam Sample Questions (Q19-Q24):NEW QUESTION # 19
During EDA, a data scientist wants to look for patterns, such as linearity, in the data. Which of the following plots should the data scientist use?
  • A. Box-and-whisker
  • B. Q-Q
  • C. Scatter
  • D. Violin
Answer: C
Explanation:
# Scatter plots are used to examine relationships and trends between two numeric variables. They are especially effective at revealing linear (or nonlinear) patterns, clusters, and outliers.
Why the other options are incorrect:
* A: Violin plots show distribution and density, not relationships.
* B: Box plots compare distributions across groups but don't reveal linearity.
* D: Q-Q plots test normality, not variable relationships.
Official References:
* CompTIA DataX (DY0-001) Official Study Guide - Section 1.2:"Scatter plots are commonly used during EDA to identify correlations, linearity, and outliers between two continuous variables."
* Data Science Fundamentals, Chapter 2 - EDA Techniques:"To assess linear trends and relationships, scatter plots provide a direct visual assessment between variables."

NEW QUESTION # 20
A data scientist trained a model for departments to share. The departments must access the model using HTTP requests. Which of the following approaches is appropriate?
  • A. Create an endpoint.
  • B. Use the File Transfer Protocol.
  • C. Deploy containers.
  • D. Utilize distributed computing.
Answer: A
Explanation:
# Creating an endpoint allows other systems or departments to access the trained model via HTTP requests.
This typically involves exposing the model as a RESTful API, allowing it to be queried by web-based systems.
Why the other options are incorrect:
* A: Distributed computing refers to computation, not access over HTTP.
* B: Containers are useful for deployment, but the endpoint enables access.
* D: FTP is used for file transfer, not model inference via HTTP.
Official References:
* CompTIA DataX (DY0-001) Official Study Guide - Section 5.4:"Endpoints are used to expose models to external consumers over HTTP protocols, often using REST APIs."
* ML Deployment Best Practices, Chapter 3:"RESTful endpoints provide real-time access to model predictions and are key for multi-team collaboration."

NEW QUESTION # 21
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. Decision tree
  • B. XGBoost
  • C. Linear discriminant analysis
  • D. Random forest
Answer: B
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."
-

NEW QUESTION # 22
Which of the following environmental changes is most likely to resolve a memory constraint error when running a complex model using distributed computing?
  • A. Moving model processing to an edge deployment
  • B. Adding nodes to a cluster deployment
  • C. Migrating to a cloud deployment
  • D. Converting an on-premises deployment to a containerized deployment
Answer: B
Explanation:
When running a model on a distributed system, encountering memory constraint errors indicates that the current nodes in the cluster do not have enough memory to handle the model. The most scalable and immediate solution is:
# Adding Nodes to a Cluster Deployment - This increases the total available memory and compute power. In distributed computing environments like Apache Spark or Hadoop, horizontal scaling via node addition is a standard remedy for resource bottlenecks, including memory limitations.
Why the other options are incorrect:
* A. Containerizing doesn't inherently solve memory issues unless paired with resource upgrades.
* B. Cloud migration may offer more resources, but without scaling configuration, memory limits may persist.
* C. Edge deployment is for low-latency, local processing - often with less memory, not more.
Official References:
* CompTIA DataX (DY0-001) Official Study Guide - Section 5.2 (Infrastructure & Scaling):"To resolve memory limitations in distributed systems, scaling out by adding nodes is the most direct and cost- effective method."
* Data Engineering Fundamentals (Cloud/Distributed Systems):"Cluster resource constraints (e.g., memory) can be mitigated by increasing node count, enabling parallel execution and expanded memory pools."
-

NEW QUESTION # 23
Which of the following JOINS would generate the largest amount of data?
  • A. LEFT JOIN
  • B. CROSS JOIN
  • C. RIGHT JOIN
  • D. INNER JOIN
Answer: B
Explanation:
# A CROSS JOIN returns the Cartesian product of the two tables - meaning every row from the first table is paired with every row from the second table. If Table A has m rows and Table B has n rows, a CROSS JOIN will return m × n rows, making it the largest possible result set of all JOIN types.
Why the other options are incorrect:
* A & B: RIGHT JOIN and LEFT JOIN return matched records plus unmatched rows from one side - but not all possible combinations.
* D: INNER JOIN returns only matched rows between tables, typically producing fewer records than a CROSS JOIN.
Official References:
* CompTIA DataX (DY0-001) Official Study Guide - Section 5.2:"CROSS JOINs generate the Cartesian product of two datasets and should be used carefully due to the exponential growth in the number of records."
* SQL for Data Scientists, Chapter 3:"CROSS JOINs can produce very large datasets, often unintentionally, due to their non-restrictive matching logic."
-

NEW QUESTION # 24
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