DY0-001 VALID EXAM REVIEW - DY0-001 VCE EXAM

DY0-001 Valid Exam Review - DY0-001 Vce Exam

DY0-001 Valid Exam Review - DY0-001 Vce Exam

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Tags: DY0-001 Valid Exam Review, DY0-001 Vce Exam, Reliable DY0-001 Real Test, DY0-001 Exam Overview, DY0-001 Valid Test Preparation

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CompTIA DataX Certification Exam Sample Questions (Q38-Q43):

NEW QUESTION # 38
Which of the following distribution methods or models can most effectively represent the actual arrival times of a bus that runs on an hourly schedule?

  • A. Normal
  • B. Binomial
  • C. Poisson
  • D. Exponential

Answer: A

Explanation:
# A Normal distribution is appropriate for modeling variables that cluster around a central mean and have natural variability - such as bus arrival times around a scheduled time. Even though the bus is scheduled hourly, real-world factors (traffic, weather, etc.) will cause actual arrival times to vary normally around the scheduled mean.
Why the other options are incorrect:
* A: Binomial is for discrete yes/no trials, not continuous time modeling.
* B: Exponential models time between events, typically memoryless - not suitable for arrival distributions with a known mean and variance.
* D: Poisson models event counts per time interval, not the timing of continuous events like arrival times.
Official References:
* CompTIA DataX (DY0-001) Study Guide - Section 1.3:"Normal distributions are appropriate for modeling real-world continuous variables that fluctuate around a central tendency, such as scheduled processes."
* Statistics for Data Science, Chapter 4 - Distributions:"Arrival times of periodic services often approximate a normal distribution when influenced by continuous variation."
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NEW QUESTION # 39
The term "greedy algorithms" refers to machine-learning algorithms that:

  • A. apply a theoretical model to the distribution of the data.
  • B. make the locally optimal decision.
  • C. update priors as more data is seen.
  • D. examine every node of a tree before making a decision.

Answer: B

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 # 40
Which of the following types of machine learning is a GPU most commonly used for?

  • A. Clustering
  • B. Tree-based
  • C. Natural language processing
  • D. Deep learning/neural networks

Answer: D

Explanation:
# GPUs (Graphics Processing Units) are optimized for parallel computations, which are essential for training deep neural networks. These models involve massive matrix operations across multiple layers, making GPUs significantly faster than CPUs in deep learning tasks.
Why the other options are incorrect:
* B: Clustering (e.g., k-means) can benefit from acceleration but doesn't usually require GPU-level computation.
* C: NLP tasks may use GPUs if they involve deep learning (e.g., transformers), but the correct choice is the model type.
* D: Tree-based models (e.g., decision trees, random forests) typically run efficiently on CPUs.
Official References:
* CompTIA DataX (DY0-001) Study Guide - Section 4.3:"Deep learning models, such as neural networks, are computationally intensive and commonly require GPUs for efficient training."
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NEW QUESTION # 41
A data scientist is standardizing a large data set that contains website addresses. A specific string inside some of the web addresses needs to be extracted. Which of the following is the best method for extracting the desired string from the text data?

  • A. Large language model
  • B. Named-entity recognition
  • C. Regular expressions
  • D. Find and replace

Answer: C

Explanation:
# Regular expressions (regex) are powerful tools for pattern matching in text. They are ideal for extracting substrings, such as domains, parameters, or specific keywords from URLs or structured text fields.
Why the other options are incorrect:
* B: NER is used to extract named entities (like names, places) - not substrings in structured text.
* C: LLMs are overkill and not efficient for simple string matching tasks.
* D: Find and replace is manual and non-scalable for large data sets.
Official References:
* CompTIA DataX (DY0-001) Official Study Guide - Section 6.3:"Regular expressions provide a flexible method to extract patterns and substrings in structured or semi-structured text."
* Data Cleaning Handbook, Chapter 3:"Regex is the most effective tool for parsing text formats like URLs, emails, or custom tags."
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NEW QUESTION # 42
Which of the following methods should a data scientist use just before switching to a potential replacement model?

  • A. Containerization
  • B. Performance monitoring
  • C. A/B testing
  • D. CI/CD

Answer: C

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 # 43
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