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Valid DY0-001 Exam Cram, DY0-001 Valid Exam Sample

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CompTIA DY0-001 Valid Exam Sample, Latest DY0-001 Exam Objectives

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CompTIA DataX Certification Exam Sample Questions (Q11-Q16):

NEW QUESTION # 11
In a modeling project, people evaluate phrases and provide reactions as the target variable for the model.
Which of the following best describes what this model is doing?

A. Part-of-speech tagging
B. TF-IDF vectorization
C. Named-entity recognition
D. Sentiment analysis

Answer: D

Explanation:
# Sentiment analysis refers to using machine learning or NLP techniques to determine the sentiment or emotional tone behind a body of text (e.g., positive, neutral, or negative). When people provide reactions to phrases, the model is learning to associate language with subjective emotion or opinion.
Why the other options are incorrect:
* B: NER identifies entities (e.g., locations, organizations) - not emotions.
* C: TF-IDF is a feature engineering method, not a modeling goal.
* D: POS tagging classifies words by their grammatical function - not sentiment.
Official References:
* CompTIA DataX (DY0-001) Official Study Guide - Section 6.3:"Sentiment analysis models associate textual input with subjective labels, such as emotional response or polarity."
* Applied Text Analytics, Chapter 8:"When modeling user reactions to text, sentiment classification techniques are commonly employed."
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NEW QUESTION # 12
A data scientist has constructed a model that meets the minimum performance requirements specified in the proposal for a prediction project. The data scientist thinks the model's accuracy should be improved, but the proposed deadline is approaching. Which of the following actions should the data scientist take first?

A. Test additional model specifications.
B. Consult the key project stakeholder.
C. Continue collecting data.
D. Request additional funding.

Answer: B

Explanation:
# The model already meets the performance goals outlined in the project proposal. However, since the deadline is near and the data scientist is considering further improvements, the correct approach is to:
# Consult the key project stakeholder. This ensures transparency and aligns actions with stakeholder priorities
- whether to proceed with deployment or invest in further model tuning.
Why the other options are incorrect:
* A: Collecting more data requires time and may exceed project scope.
* B: Requesting funding is premature and not justified if performance goals are already met.
* D: Testing new models takes time and may delay delivery - stakeholder input is needed first.
Official References:
* CompTIA DataX (DY0-001) Study Guide - Section 5.1:"Stakeholder engagement is critical in project decision-making, especially when trade-offs exist between quality and timelines."
* CRISP-DM Framework - Evaluation Phase:"Before modifying models that meet objectives, it is essential to consult business stakeholders to align with their expectations."
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NEW QUESTION # 13
Which of the following distributions would be best to use for hypothesis testing on a data set with 20 observations?

A. Power law
B. Uniform
C. Student's t-
D. Normal

Answer: C

Explanation:
# For small sample sizes (typically n < 30), the Student's t-distribution is preferred over the normal distribution for hypothesis testing because it accounts for the added uncertainty in the estimate of the standard deviation. With 20 observations, the t-distribution is more appropriate and reliable.
Why the other options are incorrect:
* A: Power law is used in modeling rare events or heavy-tailed distributions, not hypothesis testing.
* B: The normal distribution is more appropriate when the sample size is large.
* C: Uniform distribution assumes equal probability - not used in inferential statistics.
Official References:
* CompTIA DataX (DY0-001) Study Guide - Section 1.3:"The t-distribution is used for small sample hypothesis testing where the population standard deviation is unknown."
-

NEW QUESTION # 14
A data scientist is building a forecasting model for the price of copper. The only input in this model is the daily price of copper for the last ten years. Which of the following forecasting techniques is the most appropriate for the data scientist to use?

A. Relative strength
B. Autoregressive
C. Moving average
D. Dynamic time warping

Answer: B

Explanation:
# An Autoregressive (AR) model is ideal when past values of a time series are used to predict future values.
Since the only input is historical price data of copper, AR is the most appropriate technique.
Why the other options are incorrect:
* B: Moving average smooths noise but doesn't model the dependencies for prediction.
* C: Dynamic time warping is used for measuring similarity between time series, not forecasting.
* D: Relative strength is a financial metric used for comparing asset performance - not a forecasting technique.
Official References:
* CompTIA DataX (DY0-001) Study Guide - Section 3.5:"Autoregressive models are used when the goal is to predict future values based solely on past values in a univariate time series."
* Time Series Analysis and Forecasting, Chapter 5:"AR models capture the temporal dependencies in time series data and are foundational in time-based prediction."
-

NEW QUESTION # 15
Which of the following problem-solving approaches is a set of guidelines to handle highly variable and not fully apparent situations?

A. Plan
B. Heuristic
C. Schedule
D. Algorithm

Answer: B

Explanation:
# Heuristics are informal rules or guidelines used to solve problems when full information is unavailable or when optimal solutions are computationally impractical. They are often used in complex decision-making and AI.
Why the other options are incorrect:
* A: Schedule refers to timing, not problem-solving.
* B: A plan is a formal structure, not flexible for uncertain conditions.
* D: Algorithms are step-by-step procedures for defined problems - not suited for ambiguity.
Official References:
* CompTIA DataX (DY0-001) Study Guide - Section 5.1:"Heuristics provide flexible guidance for solving problems with high uncertainty or limited data."
-

NEW QUESTION # 16
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