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CompTIA DataX Certification Exam Sample Questions (Q29-Q34):

NEW QUESTION # 29
A data scientist observes findings that indicate that as electrical grids in a country become more and more connected over time, the frequency of brownouts and blackouts in total decrease, and the frequency of major brownouts and blackouts increase. Which of the following distribution metrics could best be identified?

A. Kurtosis
B. Skewness
C. Scale axis magnitudes
D. Normality

Answer: A

Explanation:
# Kurtosis is a statistical measure that describes the "tailedness" or extremity of values in a distribution. The observation that smaller events decrease while extreme events increase indicates a rise in heavy tails - a textbook sign of increasing kurtosis. This reflects a distribution becoming more prone to extreme values (e.g., more impactful blackouts).
Why the other options are incorrect:
* A: "Scale axis magnitudes" is not a statistical metric but refers to plotting.
* C: Skewness measures asymmetry, not the frequency of extreme values.
* D: Normality checks whether a distribution follows the normal distribution, not its tail behavior.
Official References:
* CompTIA DataX (DY0-001) Official Study Guide - Section 1.3:"Kurtosis measures the presence of outliers and extreme values in a distribution - higher kurtosis suggests more frequent extreme events."
* Applied Statistical Analysis, Chapter 4:"Kurtosis provides insight into the likelihood of extreme deviations and is useful in risk and reliability analysis."
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NEW QUESTION # 30
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?

A. Consult with the business team to identify which sites are responsible for chemical operations and ingest only the relevant data for analysis.
B. Ingest the data from all of the hard drives and perform exploratory data analysis to identify which business is responsible for chemical operations.
C. Perform analysis on all of the data and create a summary report on the results relevant to chemical operations.
D. Ingest data from the hard drive containing the most data and present sample results on the chemicaloperations.

Answer: A

Explanation:
# The most efficient and practical approach is to consult the business stakeholders to understand which sites or data partitions relate to chemical operations. This avoids unnecessary processing of irrelevant data and aligns with the data science best practice of combining domain knowledge with technical methods.
Why the other options are incorrect:
* A: Ingesting all data without guidance is time- and resource-intensive.
* B: Analyzing all data indiscriminately can dilute the focus on chemical business specifics.
* D: Using the largest data set arbitrarily may not reflect chemical operations and lacks targeted relevance.
Official References:
* CompTIA DataX (DY0-001) Official Study Guide - Section 5.1:"Collaboration with domain experts and stakeholders ensures the data scientist focuses on relevant sources and minimizes inefficiency in data preparation."
* CRISP-DM Model - Business Understanding Phase:"Clarifying project objectives with business input is key to aligning data selection with analytical goals."
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NEW QUESTION # 31
Which of the following problem-solving approaches is a set of guidelines to handle highly variable and not fully apparent situations?

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

Answer: C

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."
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NEW QUESTION # 32
A data analyst wants to generate the most data using tables from a database. Which of the following is the best way to accomplish this objective?

A. LEFT OUTER JOIN
B. FULL OUTER JOIN
C. INNER JOIN
D. RIGHT OUTER JOIN

Answer: B

Explanation:
# FULL OUTER JOIN returns all rows from both tables, inserting NULLs where no match exists. This join includes the maximum possible number of records - all matches, plus all unmatched records from both sides.
Why the other options are incorrect:
* A: INNER JOIN returns only matching rows - less total data.
* B & C: LEFT/RIGHT JOIN include all rows from one table only.
Official References:
* CompTIA DataX (DY0-001) Study Guide - Section 5.2:"A FULL OUTER JOIN maximizes data volume by including all matched and unmatched records from both tables."
* SQL for Data Science, Chapter 4:"Use FULL OUTER JOIN when the goal is to preserve every record from both datasets regardless of match."
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NEW QUESTION # 33
A data scientist wants to digitize historical hard copies of documents. Which of the following is the best method for this task?

A. Latent semantic analysis
B. Optical character recognition
C. Word2vec
D. Semantic segmentation

Answer: B

Explanation:
# Optical Character Recognition (OCR) is the process of converting scanned images or hard copy text into machine-encoded text. It is the standard technique for digitizing printed or handwritten content.
Why the other options are incorrect:
* A: Word2vec is for generating word embeddings from digital text.
* C: Latent Semantic Analysis analyzes semantic structure of existing digital documents.
* D: Semantic segmentation is used in image processing for pixel-wise classification - not text extraction.
Official References:
* CompTIA DataX (DY0-001) Official Study Guide - Section 6.3:"OCR converts scanned physical documents into text files that can be searched, analyzed, or stored digitally."
* Practical NLP Applications, Chapter 2:"OCR is a prerequisite for turning printed or written material into structured data suitable for text analytics."
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NEW QUESTION # 34
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