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NEW QUESTION # 27
A data scientist trained a model for departments to share. The departments must access the model using HTTP requests. Which of the following approaches is appropriate?
Answer: D
Explanation:
# Creating an endpoint allows other systems or departments to access the trained model via HTTP requests.
This typically involves exposing the model as a RESTful API, allowing it to be queried by web-based systems.
Why the other options are incorrect:
* A: Distributed computing refers to computation, not access over HTTP.
* B: Containers are useful for deployment, but the endpoint enables access.
* D: FTP is used for file transfer, not model inference via HTTP.
Official References:
* CompTIA DataX (DY0-001) Official Study Guide - Section 5.4:"Endpoints are used to expose models to external consumers over HTTP protocols, often using REST APIs."
* ML Deployment Best Practices, Chapter 3:"RESTful endpoints provide real-time access to model predictions and are key for multi-team collaboration."
NEW QUESTION # 28
Which of the following distributions would be best to use for hypothesis testing on a data set with 20 observations?
Answer: A
Explanation:
With only 20 observations and an unknown population variance, the t-distribution (with 𝑛 - 1 degrees of freedom) properly accounts for the extra uncertainty in the standard error when performing hypothesis tests.
NEW QUESTION # 29
Which of the following is the layer that is responsible for the depth in deep learning?
Answer: A
Explanation:
In deep learning, the term "depth" refers to the number of layers between the input and output. These intermediate layers are called hidden layers because their outputs are not directly observed.
Hidden layers are where the network learns hierarchical features. As more hidden layers are added, the model becomes deeper, allowing it to learn more complex patterns and representations from the data.
Why the other options are incorrect:
* A. Convolution: This is a specific type of operation applied in convolutional neural networks (CNNs) but is not the general source of model depth.
* B. Dropout: A regularization technique used to prevent overfitting; it doesn't contribute to the model's depth.
* C. Pooling: Reduces the dimensionality of feature maps; not responsible for the depth of the network.
Exact Extract and Official References:
* CompTIA DataX (DY0-001) Official Study Guide, Domain: Machine Learning
"In deep neural networks, hidden layers represent the model's depth. Each hidden layer allows the network to learn more abstract and high-level features." (Section 4.3, Deep Learning Fundamentals)
* Deep Learning Textbook by Ian Goodfellow, Yoshua Bengio, and Aaron Courville:
"Depth in deep learning refers to the number of hidden layers in the network. Each hidden layer extracts increasingly abstract features of the input data." (Chapter 6, Feedforward Deep Networks)
NEW QUESTION # 30
A data scientist would like to model a complex phenomenon using a large data set composed of categorical, discrete, and continuous variables. After completing exploratory data analysis, the data scientist is reasonably certain that no linear relationship exists between the predictors and the target. Although the phenomenon is complex, the data scientist still wants to maintain the highest possible degree of interpretability in the final model. Which of the following algorithms best meets this objective?
Answer: C
Explanation:
# Decision trees offer excellent interpretability while handling complex, non-linear relationships and multiple variable types (categorical, discrete, continuous). They provide easy-to-understand visualizations and logic- based rules, making them ideal when transparency and insight are priorities.
Why other options are incorrect:
* A: Neural networks are powerful but are considered "black box" models, with low interpretability.
* C: Linear regression assumes a linear relationship, which contradicts the scenario.
* D: Random forests are ensembles of trees - more accurate, but less interpretable.
Official References:
* CompTIA DataX (DY0-001) Study Guide - Section 4.2:"Decision trees are interpretable models that support non-linear, multi-type data with logical branching."
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NEW QUESTION # 31
Given the equation:
Xt = # + #1Xt#1 + #t, where #t # N(0, ##²)
Which of the following time series models best represents this process?
Answer: B
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 # 32
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