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

NEW QUESTION # 86
The most likely concern with a one-feature, machine-learning model is high error due to:

A. dimensionality
B. bias
C. variance
D. probability

Answer: B

Explanation:
# A one-feature model is likely to be overly simplistic and may not capture the true complexity of the target variable. This leads to underfitting, which is associated with high bias - the model consistently misses the mark regardless of the data.
Why the other options are incorrect:
* B: High dimensionality is not a concern in this case - the model has too few features.
* C: Variance refers to overfitting - more common in overly complex models.
* D: Probability is a modeling technique, not a source of error.
Official References:
* CompTIA DataX (DY0-001) Official Study Guide - Section 4.2:"Models with insufficient features tend to underfit and exhibit high bias due to their inability to represent complex relationships."
* Bias-Variance Tradeoff - Data Science Textbook:"A high-bias model makes strong assumptions and is typically too simple to capture the underlying patterns in data."

NEW QUESTION # 87
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?

A. ARIMA
B. Association rules
C. Linear regression
D. Decision trees

Answer: D

Explanation:
# 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."

NEW QUESTION # 88
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?

A. Interpolated data
B. Extrapolated data
C. In-sample data
D. Out-of-sample data

Answer: B

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 # 89
A data scientist needs to determine whether product sales are impacted by other contributing factors. The client has provided the data scientist with sales and other variables in the data set.
The data scientist decides to test potential models that include other information.
INSTRUCTIONS
Part 1
Use the information provided in the table to select the appropriate regression model.
Part 2
Review the summary output and variable table to determine which variable is statistically significant.
If at any time you would like to bring back the initial state of the simulation, please click the Reset All button.

Answer:

Explanation:
See explanation below.
Explanation:
Part 1
Linear regression.
Of the four models, linear regression has the highest R² (0.8), indicating it explains the greatest proportion of variance in sales.

Part 2
Var 4 - Net operations cost.
Net operations cost has a p-value of essentially 0 (far below 0.05), indicating it is the only additional predictor statistically significant in explaining sales. Neither inventory cost (p#0.90) nor initial investment (p#0.23) reach significance.

NEW QUESTION # 90
A data scientist is performing a linear regression and wants to construct a model that explains the most variation in the data. Which of the following should the data scientist maximize when evaluating the regression performance metrics?

A. R²
B. Accuracy
C. AUC
D. p value

Answer: A

Explanation:
# R² (coefficient of determination) quantifies how much of the variance in the dependent variable is explained by the model. A higher R² means a better fit to the data, making it the metric to maximize for explanatory power in regression analysis.
Why the other options are incorrect:
* A: Accuracy is used in classification, not regression.
* C: p-values test statistical significance of coefficients, not overall model fit.
* D: AUC (Area Under the Curve) applies to classification models, not regression.
Official References:
* CompTIA DataX (DY0-001) Study Guide - Section 3.2:"R² is a regression performance metric indicating the proportion of variance explained by the independent variables."

NEW QUESTION # 91
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