DY0-001 100% EXAM COVERAGE | COMPLETE DY0-001 EXAM DUMPS

DY0-001 100% Exam Coverage | Complete DY0-001 Exam Dumps

DY0-001 100% Exam Coverage | Complete DY0-001 Exam Dumps

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CompTIA DataX Certification Exam Sample Questions (Q69-Q74):

NEW QUESTION # 69
A movie production company would like to find the actors appearing in its top movies using data from the tables below. The resulting data must show all movies in Table 1, enriched with actors listed in Table 2.

Which of the following query operations achieves the desired data set?

  • A. Perform a UNION between Table 1 using column Movie, and Table 2 using column Acted_In.
  • B. Perform an INTERSECT between Table 1 using column Movie, and Table 2 using column Acted_In.
  • C. Perform an INNER JOIN between Table 1 using column Movie, and Table 2 using column Acted_In.
  • D. Perform a LEFT JOIN on Table 1 using column Movie, with Table 2 using column Acted_In.

Answer: D

Explanation:
# A LEFT JOIN ensures all rows from Table 1 (Top Movies) are preserved, even if there's no matching actor data in Table 2. This matches the requirement to show all movies, enriched with actor information when available.
Why the other options are incorrect:
* A: INNER JOIN would exclude movies without matching actor entries.
* B: UNION combines distinct rows - not appropriate for matching columns between two tables.
* C: INTERSECT shows only common movies - excludes unmatched top movies.
Official References:
* CompTIA DataX (DY0-001) Study Guide - Section 5.2:"LEFT JOINs are used when all records from one table (primary) must be retained, even if there are no matching rows in the secondary table."
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NEW QUESTION # 70
Given the equation:

Xt = # + #1Xt#1 + #t, where #t # N(0, ##²)
Which of the following time series models best represents this process?

  • A. SARIMA(1,1,1) × (1,1,1)1
  • B. ARIMA(1,1,1)
  • C. AR(1)
  • D. ARMA(1,1)

Answer: C

Explanation:
# The provided equation represents an autoregressive model of order 1 (AR(1)). It describes Xt as a function of its immediately prior value (Xt#1) plus white noise.
Key identifiers:
* No differencing (so not ARIMA).
* No moving average term (so not ARMA).
* No seasonal component (so not SARIMA).
Why the other options are incorrect:
* A: ARIMA(1,1,1) includes integration and MA terms, which are absent here.
* B: ARMA(1,1) includes both AR and MA terms, but only AR is present.
* C: SARIMA involves seasonal and differencing components - not applicable here.
Official References:
* CompTIA DataX (DY0-001) Study Guide - Section 3.5:"AR(p) models describe a variable as dependent on its previous values with no differencing or moving average."
* Time Series Analysis Textbook, Chapter 4:"Xt = #Xt-1 + #t describes an AR(1) process when #t is white noise."
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NEW QUESTION # 71
Which of the following JOINS would generate the largest amount of data?

  • A. INNER JOIN
  • B. RIGHT JOIN
  • C. CROSS JOIN
  • D. LEFT JOIN

Answer: C

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."
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NEW QUESTION # 72
A data scientist wants to evaluate the performance of various nonlinear models. Which of the following is best suited for this task?

  • A. ANOVA
  • B. MCC
  • C. Chi-squared test
  • D. AIC

Answer: D

Explanation:
The task is to evaluate and compare nonlinear models. In model evaluation, particularly for complex or nonlinear models, it is important to consider not only the goodness-of-fit but also the complexity of the model to avoid overfitting.
Akaike Information Criterion (AIC) is a model selection metric used to compare the relative quality of statistical models (including nonlinear models). It takes into account both the likelihood of the model (how well it fits the data) and a penalty for the number of parameters (model complexity).
Why the other options are incorrect:
* B. Chi-squared test: Typically used for testing relationships between categorical variables, not for evaluating model fit for nonlinear models.
* C. MCC (Matthews Correlation Coefficient): Used for binary classification performance, not suitable for general model evaluation across different nonlinear regression models.
* D. ANOVA (Analysis of Variance): Used to compare means among groups, often for linear models and experimental designs, not suitable for general nonlinear model evaluation.
Exact Extract and Official References:
* CompTIA DataX (DY0-001) Official Study Guide, Domain: Modeling, Analysis, and Outcomes
"AIC provides a method for model comparison, especially for nonlinear and complex models, by balancing model fit and complexity." (Section 3.2, Model Evaluation Metrics)
* Data Science Fundamentals, DS Institute:
"AIC is used extensively in selecting among competing models, especially in regression and nonlinear modeling, as it penalizes model complexity while rewarding goodness of fit." (Chapter 6, Model Evaluation)


NEW QUESTION # 73
Which of the following is best solved with graph theory?

  • A. Fraud detection
  • B. Optical character recognition
  • C. One-armed bandit
  • D. Traveling salesman

Answer: D

Explanation:
# The Traveling Salesman Problem (TSP) is a classic example in graph theory. It involves finding the shortest path that visits a set of nodes (cities) and returns to the starting point. Graph theory is used to model nodes (cities) and edges (paths between cities).
Why other options are incorrect:
* A: OCR is a computer vision problem - best handled with CNNs or ML image models.
* C: Fraud detection can involve graph-based approaches but is typically solved using anomaly detection or classification.
* D: One-armed bandit is a reinforcement learning problem - not related to graph theory.
Official References:
* CompTIA DataX (DY0-001) Study Guide - Section 3.4:"Graph theory is frequently used in routing and path optimization problems such as the Traveling Salesman."
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NEW QUESTION # 74
......

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