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NEW QUESTION # 44
Which of the below TWO examples of AI system behaviour are reward hacking?
i. An AI medical device intended to keep a patient stable may give the patient a treatment that means they recover less quickly.
ii. An AI system intended to maximise production of a commodity by weight allows quality and size of product to reduce.
iii. An AI system intended to ensure the output of a factory process is always sorted correctly, destroys the outputs.
iv. An AI system intended to remove security vulnerabilities from software code, removes all functionality that has security vulnerabilities.
Answer: C
Explanation:
The correct answer is C , covering examples iii and iv . The CT-AI syllabus defines reward hacking as the situation where an AI-based system achieves a specified goal through a "clever" or "easy" solution that perverts the designer's intent. The goal is technically satisfied, but in a way that defeats the real purpose of the system. The syllabus gives the example of an AI system targeting a highest score by hacking the stored score rather than playing the game properly.
Example iii is reward hacking because destroying the outputs may make the remaining sorting condition trivially true, but it violates the production objective. Example iv is also reward hacking because removing all vulnerable functionality eliminates vulnerabilities by destroying useful system behaviour. Examples i and ii are better categorized as negative side effects : the system pursues a stated goal while ignoring broader quality or stakeholder consequences, such as recovery speed or product quality.
References/topics: CT-AI Syllabus Chapter 2, Section 2.6 "Side Effects and Reward Hacking."
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NEW QUESTION # 45
Which of the following statements about explainable AI is correct?
Choose ONE option (1 out of 4)
Answer: B
Explanation:
Section2.10 - Explainability and Transparencyof the ISTQB CT-AI syllabus describes explainable AI as the ability of a system to provide human-understandable insight into its decisions. The syllabus referencesThe Royal Society's reportas a foundational source explaining why explainability is important. Among the stated motivations is the need toincrease user trust and confidencein AI systems by making their decisions understandable and justifiable. Therefore, OptionCdirectly reflects the syllabus content .
Option A is incorrect because interpretability doesnotrefer to determining correctness of outputs; rather, it refers to understandinghowthe model arrives at outputs. Option B incorrectly frames explainability as the ability to investigate algorithms or training data; explainability is aboutunderstanding the model's decision- making, not reverse engineering its components. Option D is incorrect because explainability doesnot eliminate the need for risk and vulnerability assessments; the syllabus clearly emphasizes that testing, risk assessment, and robustness checks remain critical even when a model is explainable.
Thus, the only statement consistent with the syllabus isOption C.
NEW QUESTION # 46
You have been developing test automation for an e-commerce system. One of the problems you are seeing is that object recognition in the GUI is having frequent failures. You have determined this is because the developers are changing the identifiers when they make code updates. How could AI help make the automation more reliable?
Answer: A
Explanation:
The syllabus discusses using AI-based tools to reduce GUI test brittleness:
"AI can be used to reduce the brittleness of this approach, by employing AI-based tools to identify the correct objects using various criteria (e.g., XPath, label, id, class, X/Y coordinates), and to choose the historically most stable identification criteria."
NEW QUESTION # 47
Which of the following is an example of a clustering problem that can be resolved by unsupervised learning?
Answer: A
Explanation:
The syllabus defines clustering as:
"Clustering: This is when the problem requires the identification of similarities in input data points that allows them to be grouped based on common characteristics or attributes. For example, clustering is used to categorize different types of customers for the purpose of marketing."
NEW QUESTION # 48
Consider a machine learning model where the model is attempting to predict if a patient is at risk for stroke.
The model collects information on each patient regarding their blood pressure, red blood cell count, smoking, status, history of heart disease, cholesterol level, and demographics. Then, using a decision tree the model predicts whether or not the associated patient is likely to have a stroke in the near future. One the model is created using a training data set, it is used to predict a stroke in 80 additional patients. The table below shows a confusion matrix on whether or not the model mode a correct or incorrect prediction.
The testers have calculated what they believe to be an appropriate functional performance metric for the model. They calculated a value of 2/3 or 0.6667.
Answer: A
Explanation:
The problem describes aclassification modelthat predicts whether a patient is at risk for a stroke. The confusion matrix is provided, and the testers have calculated a performance metric as2/3 or 0.6667.
From theISTQB Certified Tester AI Testing (CT-AI) Syllabus, the definitions of functional performance metrics from a confusion matrix include:
* Accuracy:
Accuracy=TP+TNTP+TN+FP+FNAccuracy = \frac{TP + TN}{TP + TN + FP + FN}
Accuracy=TP+TN+FP+FNTP+TN
* Measures the proportion of correctly classified instances(both true positives and true negatives) over the total dataset.
* If the value is0.6667, it suggests that the metric includesboth correct positive and negative classifications, aligning with accuracy.
* Precision:
Precision=TPTP+FPPrecision = \frac{TP}{TP + FP}Precision=TP+FPTP
* Measures how manypredicted positive caseswere actually positive.
* Doesnotmatch the given calculation.
* Recall (Sensitivity):
Recall=TPTP+FNRecall = \frac{TP}{TP + FN}Recall=TP+FNTP
* Measures how manyactual positiveswere correctly identified.
* Doesnotmatch the 0.6667 value.
* F1-Score:
F1=2×Precision×RecallPrecision+RecallF1 = 2 \times \frac{Precision \times Recall}{Precision + Recall} F1=2×Precision+RecallPrecision×Recall
* A balance between precision and recall.
* The formula isdifferent from the provided calculation.
Since the formula foraccuracymatches the calculated value of0.6667, the best answer isD. Accuracy.
Certified Tester AI Testing Study Guide References:
* ISTQB CT-AI Syllabus v1.0, Section 5.1 (Confusion Matrix and Functional Performance Metrics)
* ISTQB CT-AI Syllabus v1.0, Section 5.4 (Selecting ML Functional Performance Metrics)
NEW QUESTION # 49
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