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質問 # 18
Which of the following compute delivery models allows packaging of only critical dependencies while developing a reusable asset?
正解：A
解説：
# Containers (e.g., Docker) allow developers to package an application along with only the necessary runtime, libraries, and critical dependencies. This makes the asset lightweight, reusable, and portable across environments. Unlike virtual machines, containers share the host OS kernel and are far more efficient in packaging only what's essential.
Why the other options are incorrect:
* A: Thin clients refer to client-server models with minimal local processing - not relevant to dependency packaging.
* C: Virtual machines include an entire OS, leading to more overhead than necessary for reusable assets.
* D: Edge devices are hardware-based deployments typically used in IoT scenarios, not packaging tools.
Official References:
* CompTIA DataX (DY0-001) Official Study Guide - Section 5.2:"Containers enable consistent development environments by packaging applications and only critical dependencies, making them ideal for portability and reuse."
* Docker Documentation:"Containers package code and dependencies into a single unit of software, ensuring consistency across environments while minimizing overhead."
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質問 # 19
Given matrix
Which of the following is AT?
正解：D
解説：
# 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)."
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質問 # 20
Which of the following is best solved with graph theory?
正解：C
解説：
# 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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質問 # 21
A company created a very popular collectible card set. Collectors attempt to collect the entire set, but the availability of each card varies, because some cards have higher production volumes than others. The set contains a total of 12 cards. The attributes of the cards are shown.
The data scientist is tasked with designing an initial model iteration to predict whether the animal on the card lives in the sea or on land, given the card's features: Wrapper color, Wrapper shape, and Animal.
Which of the following is the best way to accomplish this task?
正解：C
解説：
# Decision trees are supervised classification models that can be used to predict a categorical target variable (e.
g., Habitat: Land or Sea) based on input features (e.g., Wrapper color, Wrapper shape, Animal type). They are interpretable, require minimal preprocessing, and are ideal for structured categorical data like this.
Why the other options are incorrect:
* A: ARIMA (AutoRegressive Integrated Moving Average) is used for time-series forecasting, not classification.
* B: Linear regression is used for predicting continuous numeric values, not categorical variables like
"Land" or "Sea".
* C: Association rules (like in market basket analysis) are used to discover relationships or co-occurrence among variables, not to build predictive models.
Official References:
* CompTIA DataX (DY0-001) Study Guide - Section 4.1 & 4.2:"Decision trees are powerful classifiers for categorical output variables and allow for interpretable models based on feature splits."
* Machine Learning Textbook, Chapter 6:"Decision trees are ideal for early-stage model prototyping when the output is categorical and the data structure is tabular."
質問 # 22
Which of the following JOINS would generate the largest amount of data?
正解：C
解説：
# 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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質問 # 23
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