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CompTIA DataX Certification Exam Sample Questions (Q27-Q32):
NEW QUESTION # 27
A data scientist is merging two tables. Table 1 contains employee IDs and roles. Table 2 contains employee IDs and team assignments. Which of the following is the best technique to combine these data sets?
Answer: A
Explanation:
# An inner join returns only those records that have matching keys (employee IDs in this case) in both tables.
Since each table provides a different attribute for the same entity (employee), an inner join is the most efficient and accurate method when focusing on employees present in both tables.
Why the other options are less ideal:
* B & C: Left or right joins would include unmatched data, which may lead to nulls.
* D: An outer join brings in all records from both tables and fills nulls where no matches exist, which may introduce irrelevant or incomplete entries.
Official References:
* CompTIA DataX (DY0-001) Official Study Guide - Section 5.2:"Inner joins are most appropriate when combining datasets with matching keys to retain only relevant, intersecting records."
* SQL for Data Analysts, Chapter 3:"Use inner joins when combining tables on a common key to include only matched data for analysis."
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NEW QUESTION # 28
A team is building a spam detection system. The team wants a probability-based identification method without complex, in-depth training from the historical data set. Which of the following methods would best serve this purpose?
Answer: A
Explanation:
# Naive Bayes is a probabilistic classification algorithm based on Bayes' theorem. It is lightweight, fast, and effective for text-based classification problems like spam detection. It also performs well with small or simple training sets.
Why the other options are incorrect:
* A: Logistic regression is also probabilistic but requires more feature preprocessing.
* B: Random forest is accurate but computationally heavier.
* D: Linear regression is for continuous targets - not suitable for classification.
Official References:
* CompTIA DataX (DY0-001) Study Guide - Section 4.1:"Naive Bayes classifiers are ideal for spam detection and similar applications due to their efficiency and probabilistic nature."
* Text Classification Techniques, Chapter 4:"Naive Bayes requires minimal training and works well with high-dimensional, sparse data such as email content."
NEW QUESTION # 29
The following graphic shows the results of an unsupervised, machine-learning clustering model:
k is the number of clusters, and n is the processing time required to run the model. Which of the following is the best value of k to optimize both accuracy and processing requirements?
Answer: B
Explanation:
# The graph represents a classic "elbow curve," which is often used in clustering (e.g., k-means) to help determine the optimal number of clusters. The point where the curve starts to level off (the "elbow") reflects the best trade-off between model accuracy and processing efficiency.
In this graph, the elbow visually occurs around k = 10. Beyond that, the processing time continues to decrease, but the marginal gain in clustering quality (or drop in processing time) diminishes.
Why the other options are incorrect:
* A: k = 2 underfits the data - too few clusters.
* C & D: k = 15 or 20 provides minimal additional benefit in processing but may overcomplicate the model.
Official References:
* CompTIA DataX (DY0-001) Study Guide - Section 4.2:"The elbow method identifies the optimal number of clusters where the rate of improvement drops significantly."
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NEW QUESTION # 30
Given the equation:
Xt = # + #1Xt#1 + #t, where #t # N(0, ##²)
Which of the following time series models best represents this process?
Answer: C
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 # 31
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?
Answer: A
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 # 32
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