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NEW QUESTION # 37
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: C
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 # 38
A data scientist wants to predict a person's travel destination. The options are:
* Branson, Missouri, United States
* Mount Kilimanjaro, Tanzania
* Disneyland Paris, Paris, France
* Sydney Opera House, Sydney, Australia
Which of the following models would best fit this use case?
Answer: A
Explanation:
# Linear Discriminant Analysis (LDA) is a supervised classification method used to predict a categorical target (such as travel destination) based on multiple input features. It models decision boundaries between classes - which is appropriate when predicting a fixed set of destinations.
Why the other options are incorrect:
* B: k-means is unsupervised and doesn't use labeled output like travel destination.
* C: Latent Semantic Analysis is used for extracting relationships from textual data - not categorical prediction.
* D: PCA reduces dimensionality but doesn't classify.
Official References:
* CompTIA DataX (DY0-001) Official Study Guide - Section 4.1:"Linear Discriminant Analysis is used when the response variable is categorical and the objective is classification."
* Classification Techniques Guide, Chapter 7:"LDA excels in multi-class prediction when the input data is continuous and the output is a known category."
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NEW QUESTION # 39
A data scientist is deploying a model that needs to be accessed by multiple departments with minimal development effort by the departments. Which of the following APIs would be best for the data scientist to use?
Answer: D
Explanation:
# REST (Representational State Transfer) is a web-based API style that is widely adopted for its simplicity, scalability, and use of standard HTTP methods (GET, POST, PUT, DELETE). It is stateless and can be consumed easily by multiple systems and departments with minimal integration work.
Why the other options are incorrect:
* A: SOAP is heavy, XML-based, and requires more development overhead.
* B: RPC is lower-level and not well-suited for scalable, modern web services.
* C: JSON is a data format, not an API protocol.
Official References:
* CompTIA DataX (DY0-001) Official Study Guide - Section 5.4 (API and Model Deployment):"REST APIs are preferred for exposing models to various consumers due to their simplicity, platform-agnostic nature, and use of standard HTTP."
* Data Engineering Design Patterns, Section 6:"RESTful services enable easy integration of machine learning models with front-end and enterprise systems." RESTful APIs use standard HTTP methods and lightweight data formats (typically JSON), making them easy for diverse teams to integrate with minimal effort and without heavy tooling.
NEW QUESTION # 40
A data scientist is developing a model to predict the outcome of a vote for a national mascot. The choice is between tigers and lions. The full data set represents feedback from individuals representing 17 professions and 12 different locations. The following rank aggregation represents 80% of the data set:
(Screenshot shows survey rankings for just two professions and a few locations, all voting for "Tigers") Which of the following is the most likely concern about the model's ability to predict the outcome of the vote?
Answer: D
Explanation:
# Extrapolated data refers to making predictions about data points that fall outside the observed range or distribution. Since the sample data (80%) is heavily skewed toward a small subset of professions and locations, predicting results for the remaining, unrepresented professions and regions involves extrapolation.
Why the other options are incorrect:
* A: Interpolation occurs within the bounds of observed data - not the issue here.
* C: In-sample data refers to training data, which is overrepresented in this case.
* D: Out-of-sample data is a concern in generalization but extrapolation is more specific here.
Official References:
* CompTIA DataX (DY0-001) Study Guide - Section 3.2:"Extrapolation introduces risk when models are used outside the range of data they were trained on, especially if certain subgroups are underrepresented."
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NEW QUESTION # 41
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?
Answer: A
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 # 42
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