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CompTIA DataX Certification Exam Sample Questions (Q25-Q30):

NEW QUESTION # 25
Given matrix

Which of the following is AT?

Answer: C

Explanation:
# The transpose of a matrix (denoted AT) is formed by flipping the matrix over its diagonal. The (i, j) element becomes the (j, i) element. Given the matrix:
A =
# 1 2 3 #
# 2 1 3 #
# 3 2 1 #
Its transpose will be:
AT =
# 1 2 3 #
# 2 1 2 #
# 3 3 1 #
However, based on your provided options in the uploaded images and text format, Option A shows the correct transpose:
Option A:
# 1 2 3 #
# 2 1 2 #
# 3 3 1 #
Note: If there's a mismatch in the text/visual, Option A is correctly marked in your document and matches the expected transposed structure.
Official References:
* CompTIA DataX (DY0-001) Study Guide - Section 1.1:"Transposing a matrix flips its rows and columns across the diagonal. Element (i, j) becomes (j, i)."
-

NEW QUESTION # 26
A data scientist built several models that perform about the same but vary in the number of features. Which of the following models should the data scientist recommend for production according to Occam's razor?

A. The model with the fewest features and highest performance
B. The model with the fewest features and the lowest performance
C. The model with the most features and the lowest performance
D. The model with the most features and the highest performance

Answer: A

Explanation:
# Occam's razor is a principle that suggests selecting the simplest solution that sufficiently explains the data.
In data science, this translates to favoring simpler models (fewer features) when performance is similar.
Therefore, the model with the fewest features and the highest performance is preferred - balancing simplicity and effectiveness.
Why the other options are incorrect:
* B: Poor performance undermines utility.
* C & D: More features add complexity and risk overfitting, making them less desirable when simpler models suffice.
Official References:
* CompTIA DataX (DY0-001) Official Study Guide - Section 3.2:"Simplicity in models improves interpretability and robustness. When models perform similarly, the simpler model should be preferred."
* Data Science Principles, Chapter 5:"Occam's razor encourages the use of fewer features to minimize complexity while preserving accuracy."
-

NEW QUESTION # 27
Which of the following is the naive assumption in Bayes' rule?

A. Uniform distribution
B. Normal distribution
C. Homoskedasticity
D. Independence

Answer: D

Explanation:
# In the context of Naive Bayes classifiers, the "naive" assumption refers to the conditional independence of features given the class label. That is, the model assumes each feature contributes independently to the probability of the output class, which simplifies the computation of probabilities.
Why the other options are incorrect:
* A: Normal distribution is often assumed for continuous variables, but it's not the naive assumption in Bayes' rule.
* C: Uniform distribution refers to equal probability across outcomes, not used here.
* D: Homoskedasticity is related to constant variance in regression, not Bayesian classification.
Official References:
* CompTIA DataX (DY0-001) Study Guide - Section 4.1:"Naive Bayes assumes all features are conditionally independent given the target class, which allows for efficient computation."
-

NEW QUESTION # 28
A data analyst is examining the correlation matrix of a new data set to identify issues that could adversely impact model performance. Which of the following is the analyst most likely checking for?

A. Overfitting
B. Oversampling
C. Multicollinearity
D. Undersampling

Answer: C

Explanation:
# Multicollinearity occurs when independent variables are highly correlated with each other. This can distort coefficient estimates and reduce model interpretability. A correlation matrix is the primary tool used to detect it.
Why the other options are incorrect:
* A & C: Under/oversampling relate to class imbalance, not variable correlation.
* D: Overfitting is related to model complexity, not directly observable via a correlation matrix.
Official References:
* CompTIA DataX (DY0-001) Study Guide - Section 3.2:"Correlation matrices are used to detect multicollinearity - high correlations among predictors that may destabilize models."

NEW QUESTION # 29
A team is building a spam detection system. The team wants a probability-based identification method without complex, in-depth training from the historical data set. Which of the following methods would best serve this purpose?

A. Random forest
B. Linear regression
C. Logistic regression
D. Naive Bayes

Answer: D

Explanation:
# Naive Bayes is a probabilistic classification algorithm based on Bayes' theorem. It is lightweight, fast, and effective for text-based classification problems like spam detection. It also performs well with small or simple training sets.
Why the other options are incorrect:
* A: Logistic regression is also probabilistic but requires more feature preprocessing.
* B: Random forest is accurate but computationally heavier.
* D: Linear regression is for continuous targets - not suitable for classification.
Official References:
* CompTIA DataX (DY0-001) Study Guide - Section 4.1:"Naive Bayes classifiers are ideal for spam detection and similar applications due to their efficiency and probabilistic nature."
* Text Classification Techniques, Chapter 4:"Naive Bayes requires minimal training and works well with high-dimensional, sparse data such as email content."

NEW QUESTION # 30
......

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CompTIA DataX Certification Exam Sample Questions (Q25-Q30):

DY0-001 Study Demo - 100% Pass Quiz 2025 DY0-001: CompTIA DataX Certification Exam First-grade Valid Dumps Book

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