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| Section | Weight | Objectives |
|---|---|---|
| Modeling, Analysis, and Outcomes | 24% | - Data preparation and exploratory data analysis - Result interpretation and business communication - Predictive and prescriptive analytics - Feature engineering and selection - Model selection and evaluation metrics |
| Specialized Applications of Data Science | 13% | - Industry-specific analytics use cases - Time-series analysis - Natural Language Processing (NLP) - Anomaly detection and signal processing - Computer Vision |
| Operations and Processes | 22% | - Version control and reproducibility - Model deployment and monitoring - Data governance and quality management - Security and compliance in data operations - Data pipeline design and maintenance |
| Machine Learning | 24% | - Deep learning fundamentals - Supervised, unsupervised, and reinforcement learning - Algorithm selection and implementation - Hyperparameter tuning and optimization - Ethics and bias in machine learning |
| Mathematics and Statistics | 17% | - Linear algebra fundamentals - Probability theory and distributions - Bayesian reasoning and modeling - Statistical inference and hypothesis testing - Calculus and optimization concepts |
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NEW QUESTION # 68
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?
Answer: A
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."
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NEW QUESTION # 69
Which of the following environmental changes is most likely to resolve a memory constraint error when running a complex model using distributed computing?
Answer: D
Explanation:
Increasing the number of nodes in your cluster directly expands the total available memory across the distributed system, alleviating memory‐constraint errors without changing your code or deployment paradigm. Containerization or edge deployments don't inherently provide more memory, and migrating to the cloud alone doesn't guarantee additional nodes unless you explicitly scale out.
NEW QUESTION # 70
Which of the following measures would a data scientist most likely use to calculate the similarity of two text strings?
Answer: A
Explanation:
# Edit distance (also known as Levenshtein distance) measures how many single-character edits (insertions, deletions, or substitutions) are needed to transform one string into another. It's a common metric for assessing string similarity, especially in natural language processing (NLP) tasks.
Why the other options are incorrect:
* A: Word clouds visualize word frequency, not similarity.
* C: String indexing is a method for referencing string positions, not comparison.
* D: k-NN is a classification algorithm, not a string similarity measure.
Official References:
* CompTIA DataX (DY0-001) Study Guide - Section 6.3:"Edit distance is a key similarity metric in text comparison tasks, particularly in cleaning or matching string records."
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NEW QUESTION # 71
A data analyst wants to use compression on an analyzed data set and send it to a new destination for further processing. Which of the following issues will most likely occur?
Answer: C
Explanation:
Compression and decompression are CPU‐intensive operations; on large data sets, the extra processing load can significantly spike CPU utilization. Memory, OS support, or library dependencies are far less likely to be the primary bottleneck in a standard compression workflow.
NEW QUESTION # 72
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?
Answer: D
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 # 73
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