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CompTIA DataX Certification Exam Sample Questions (Q86-Q91):

NEW QUESTION # 86
A data scientist is building a forecasting model for the price of copper. The only input in this model is the daily price of copper for the last ten years. Which of the following forecasting techniques is the most appropriate for the data scientist to use?

A. Autoregressive
B. Moving average
C. Dynamic time warping
D. Relative strength

Answer: A

Explanation:
# An Autoregressive (AR) model is ideal when past values of a time series are used to predict future values.
Since the only input is historical price data of copper, AR is the most appropriate technique.
Why the other options are incorrect:
* B: Moving average smooths noise but doesn't model the dependencies for prediction.
* C: Dynamic time warping is used for measuring similarity between time series, not forecasting.
* D: Relative strength is a financial metric used for comparing asset performance - not a forecasting technique.
Official References:
* CompTIA DataX (DY0-001) Study Guide - Section 3.5:"Autoregressive models are used when the goal is to predict future values based solely on past values in a univariate time series."
* Time Series Analysis and Forecasting, Chapter 5:"AR models capture the temporal dependencies in time series data and are foundational in time-based prediction."
-

NEW QUESTION # 87
A data scientist is building an inferential model with a single predictor variable. A scatter plot of the independent variable against the real-number dependent variable shows a strong relationship between them.
The predictor variable is normally distributed with very few outliers. Which of the following algorithms is the best fit for this model, given the data scientist wants the model to be easily interpreted?

A. A probit regression
B. A linear regression
C. A logistic regression
D. An exponential regression

Answer: B

Explanation:
The scenario provided describes a modeling problem with the following characteristics:
* A single continuous predictor variable (independent variable).
* A continuous real-number dependent variable.
* The relationship between the variables appears strong and linear, as observed from the scatter plot.
* The predictor variable is normally distributed with minimal outliers.
* The goal is to maintain interpretability in the model.
Based on the above, the most appropriate modeling technique is:
Linear Regression: This is a statistical method used to model the linear relationship between a continuous dependent variable and one or more independent variables. In simple linear regression, a straight line (y = mx
+ b) represents the relationship, where the slope and intercept can be easily interpreted. This method is preferred when the relationship is linear, the assumptions of normality and homoscedasticity are satisfied, and interpretability is required.
Why the other options are incorrect:
* A. Logistic Regression: This is used when the dependent variable is categorical (e.g., binary classification), not continuous. Therefore, not suitable for this case.
* B. Exponential Regression: Applied when the data shows an exponential growth or decay pattern, which is not implied here.
* D. Probit Regression: Similar to logistic regression but based on a normal cumulative distribution.
Used for categorical outcomes, not continuous variables.
Exact Extract and Official References:
* CompTIA DataX (DY0-001) Official Study Guide, Domain: Modeling, Analysis, and Outcomes:
"Linear regression is the most interpretable form of regression modeling. It assumes a linear relationship between independent and dependent variables and is ideal for inferential modeling when interpretability is important." (Section 3.1, Model Selection Criteria)
* Data Science Fundamentals, by CompTIA and DS Institute:
"Linear regression is a robust and interpretable statistical method used for modeling continuous outcomes. It provides coefficients which help in understanding the strength and direction of the relationship." (Chapter 4, Regression Techniques)

NEW QUESTION # 88
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?

A. Artificial neural network
B. Multiple linear regression
C. Decision tree
D. Random forest

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."
-

NEW QUESTION # 89
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?

A. REST
B. SOAP
C. RPC
D. JSON

Answer: A

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 # 90
A data scientist has built an image recognition model that distinguishes cars from trucks. The data scientist now wants to measure the rate at which the model correctly identifies a car as a car versus when it misidentifies a truck as a car. Which of the following would best convey this information?

A. Box plot
B. Confusion matrix
C. Correlation plot
D. AUC/ROC curve

Answer: B

Explanation:
# A confusion matrix gives a detailed view of a classification model's performance, including true positives, false positives, true negatives, and false negatives. It's the best tool for examining model accuracy and misclassification between specific classes - like mislabeling trucks as cars.
Why the other options are incorrect:
* B: AUC/ROC gives a broader performance summary but not individual class misclassifications.
* C: Box plots show distributions, not classification accuracy.
* D: Correlation plots show relationships between variables - not confusion results.
Official References:
* CompTIA DataX (DY0-001) Study Guide - Section 4.3:"Confusion matrices enable detailed analysis of classification performance and misclassification rates."
* Machine Learning Textbook, Chapter 5:"For evaluating how models classify specific classes, confusion matrices are the most direct and interpretable tool."
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NEW QUESTION # 91
......

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CompTIA DataX Certification Exam Sample Questions (Q86-Q91):

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