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NEW QUESTION # 10
Select the most CORRECT statement.
Answer: C
Explanation:
The correct answer is D. a and c only because dimensionality reduction is the process of reducing the number of variables or features considered in a dataset while trying to preserve the most important information. This is especially useful when working with large datasets that contain many columns, attributes, or variables.
Reducing dimensionality can improve model performance, reduce computational cost, remove noise, and make data easier to visualize and analyze.
Statement A is correct because dimensionality reduction reduces the number of variables considered in the analysis. Statement C is also correct because Principal Component Analysis, or PCA, is one of the most common techniques used to reduce the dimensionality of large datasets. PCA transforms the original variables into a smaller set of principal components that capture most of the important variance in the data.
Statement B is not correct because dimensionality reduction is not about reducing "targetted variables." It focuses mainly on reducing input features or random variables. Therefore, the best answer is D. a and c only .
NEW QUESTION # 11
Choose the CORRECT statement for Naive Bayes classifier.
Answer: B
Explanation:
The correct answer is D. a and c only . Naive Bayes is a supervised machine learning classification algorithm based on Bayes' theorem. It is called "naive" because it assumes that the features used for prediction are conditionally independent of one another, even though this may not always be fully true in real-world data.
Therefore, statement A is correct because the algorithm treats each feature as an independent variable when calculating class probabilities.
Statement C is also correct because Naive Bayes is commonly used for classification problems such as spam detection, where the model predicts whether an email is spam or not spam. It is also used in sentiment analysis, text classification, document categorization, and simple probabilistic classification tasks.
Statement B is not the best statement because the key idea is not about "unique features" specifically, but about the independence assumption applied to features. Therefore, the correct answer is D. a and c only .
NEW QUESTION # 12
Which of the following is the CORRECT stage of the Data and AI Analytics Business Model Maturity Index?
Answer: B
Explanation:
The correct answer is E. All of the above because the Data and AI Analytics Business Model Maturity Index describes how organizations progress in their ability to use data, analytics, and AI for business value creation.
Business Monitoring is a valid stage because organizations first use data to observe performance, track metrics, and understand what is happening in the business. Business Insights is also a correct stage because analytics then helps organizations explain why things are happening and identify patterns, opportunities, and risks.
Business Optimization is another valid stage because mature organizations use analytics and AI to improve processes, decisions, resources, customer experiences, and operational outcomes. Cultural Transformation is also part of maturity because long-term AI and data success requires a shift in mindset, leadership behavior, decision-making culture, and enterprise-wide adoption of data-driven practices.
Since all listed options represent stages or maturity areas in the Data and AI Analytics Business Model Maturity Index, the correct answer is E. All of the above .
NEW QUESTION # 13
Choose the CORRECT example of Reinforcement Learning.
Answer: C
Explanation:
The correct answer is D. All of the above because robotics, game playing, and navigation are all common examples of reinforcement learning. Reinforcement learning is a machine learning approach in which an agent learns by interacting with an environment and receiving rewards or penalties based on its actions. Over time, the agent learns a policy that helps it maximize long-term reward.
Robotics is a strong example because robots can learn movement, object handling, path planning, and control actions through trial and feedback. Game playing is another classic reinforcement learning example because an AI agent can learn winning strategies by trying actions, observing outcomes, and improving decisions over repeated episodes. Navigation is also a valid example because an agent can learn the best route or movement strategy by receiving feedback about distance, obstacles, time, or success in reaching a goal.
Since all three listed options are valid applications of reinforcement learning, the correct answer is D. All of the above .
NEW QUESTION # 14
An AI agent learns to play a game by taking actions, receiving rewards for good moves, and penalties for poor moves. Over time, it improves its strategy to maximize total reward. This is an example of ______.
Answer: E
Explanation:
Reinforcement learning is the correct answer because the AI agent learns by interacting with an environment and improving its behavior based on rewards and penalties. The goal of reinforcement learning is to learn a policy or strategy that maximizes cumulative reward over time. This differs from supervised learning, where the model learns from labeled input-output examples. It also differs from unsupervised learning, where the model searches for hidden patterns without labels or rewards. Semi-supervised learning is incorrect because the scenario does not involve a mix of labeled and unlabeled data. Regression learning is also incorrect because regression predicts continuous numerical values, while this example focuses on action selection and reward optimization. Therefore, the correct answer is C. reinforcement learning .
NEW QUESTION # 15
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