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ISQI ISTQB Certified Tester Foundation Level (CTFL) v4.0 Sample Questions (Q69-Q74):

NEW QUESTION # 69
Following a risk-based testing approach you have designed 10 tests to cover a product risk with a high-risk level. You want to estimate, adopting the three-point test estimation technique, the test effort required to reduce the risk level to zero by executing those 10 tests. You made the following three initial estimates:
* most optimistic = 6 person hours
* most likely = 30 person hours
* most pessimistic = 54 person hours
Based only on the given information, which of the following answers about the three-point test estimation technique applied to this problem is true?

A. The final estimate is between 6 person hours and 54 person hours
B. The final estimate is exactly 30 person hours because the technique uses the initial most likely estimate as the final estimate
C. The final estimate is exactly 30 person hours because the technique uses the arithmetic mean of the three initial estimates as the final estimate
D. The final estimate is between 22 person hours and 38 person hours

Answer: D

Explanation:
The three-point test estimation technique is a method of estimating the test effort based on three initial estimates: the most optimistic, the most likely, and the most pessimistic. The technique uses a weighted average of these three estimates to calculate the final estimate, which is also known as the expected value. The formula for the expected value is:
Expected value = (most optimistic + 4 * most likely + most pessimistic) / 6 Using the given values, the expected value is:
Expected value = (6 + 4 * 30 + 54) / 6 Expected value = 30 person hours However, the expected value is not the only factor to consider when estimating the test effort. The technique also calculates the standard deviation, which is a measure of the variability or uncertainty of the estimates.
The formula for the standard deviation is:
Standard deviation = (most pessimistic - most optimistic) / 6
Using the given values, the standard deviation is:
Standard deviation = (54 - 6) / 6 Standard deviation = 8 person hours
The standard deviation can be used to determine a range of possible values for the test effort, based on a certain level of confidence. For example, using a 68% confidence level, the range is:
Expected value ± standard deviation
Using the calculated values, the range is:
30 ± 8 person hours
Therefore, the final estimate is between 22 person hours and 38 person hours, which is option A.
1: ISTQBCertified Tester Foundation Level Syllabus v4.01, Section 2.3.2, page 24-25; ISTQBGlossary v4.
02, page 33.

NEW QUESTION # 70
The following 4 equivalence classes are given:

Which of the following alternatives includes correct test values for x. based on equivalence partitioning?

A. -99; 99:101; 1001
B. -1000; -100; 100; 1000
C. -100; 100:1000; 1001
D. -500; 0; 100; 1000

Answer: B

Explanation:
* The question is about selecting the correct test values for x based on equivalence partitioning.
Equivalence partitioning is a software test design technique that divides the input data of a software unit into partitions of equivalent data from which test cases can be derived. In this case, the given equivalence classes are:
* (x leq -100)
* (-100 < x < 100)
* (100 leq x < 1000)
* (x geq 1000)
Option D provides a value from each of these partitions:
* For (x leq -100), it gives -1000.
* For (-100 < x < 100), it gives -100 and 100.
* For (100 leq x < 1000), it gives 500.
* For (x geq 1000), it gives 1500.
So, option D covers all four given equivalence classes with appropriate values.
References: ISTQB Certified Tester Foundation Level (CTFL) v4.0 documents available at ISTQB and ASTQB.
1: ISTQB Foundation Level Syllabus 2018, Version 4.0, p. 38
2: ISTQB Foundation Level Syllabus 2018, Version 4.0, p. 39
3: ISTQB Foundation Level Syllabus 2018, Version 4.0, p. 40

NEW QUESTION # 71
Confirmation testing is performed after:

A. a failed test, and aims to run that test again to confirm that the same behavior still occurs and thus appears to be reproducible
B. the execution of an automated regression test suite to confirm the absence of false positives in the test results
C. a defect is fixed, and if such testing is successful then the regression tests that are relevant for such fix can be executed
D. a defect is fixed and after other tests do not find any side-effect introduced in the software as a result of such fix

Answer: C

Explanation:
Confirmation testing is performed after a defect is fixed, and if such testing is successful then the regression tests that are relevant for such fix can be executed. Confirmation testing, also known as re-testing, is the process of verifying that a defect has been resolved by running the test case that originally detected the defect.
Confirmation testing is usually done before regression testing, which is the process of verifying that no new defects have been introduced in the software as a result of changes or fixes. Therefore, option D is the correct answer.
References: ISTQB Certified Tester Foundation Level Syllabus v4.01, Section 2.4.1, page 28; ISTQB Glossary v4.02, page 15.

NEW QUESTION # 72
Which of the following statements about error guessing is true?

A. Error guessing refers to the ability of a system or component to continue normal operation despite the presence of erroneous inputs
B. Error guessing is a system that adopts artificial intelligence to predict whether software components are likely to contain defects or not
C. Experienced testers, when applying error guessing, rely on the use of a high-level list of what needs to be tested as a guide to find defects
D. Experienced testers, when applying error guessing technique, can anticipate where errors, defects and failures have occurred and target their tests at those issues

Answer: D

Explanation:
This answer is correct because error guessing is a test design technique where the experience and intuition of the tester are used to anticipate where errors, defects and failures have occurred or are likely to occur, and to design test cases to expose them. Error guessing can be based on factors such as the complexity of the system or component, the known or suspected weaknesses of the system or component, the previous history of defects, or the common types of errors in the domain or technology. Error guessing can be used as a complementary technique to other more systematic or formal techniques, or when there is insufficient information or time to apply them. Reference: ISTQB Glossary of Testing Terms v4.0, ISTQB Foundation Level Syllabus v4.0, Section 2.3.2.5

NEW QUESTION # 73
A new web app aims at offering a rich user experience. As a functional tester, you have run some functional tests to verify that, before releasing the app, such app works correctly on several mobile devices, all of which are listed as supported devices within the requirements specification. These tests were performed on stable and isolated test environments where you were the only user interacting with the application. All tests passed, but in some of those tests you observed the following issue: on some mobile devices only, the response time for two web pages containing images was extremely slow.
Based only on the given information, which of the following recommendation would you follow?

A. The issue is related to performance efficiency, not functionality. Thus, as a functional tester, you should not open any defect report as all the functional tests passed
B. You should not open any defect report as the problem is most likely due to poor hardware equipment on the devices where you observed the issue
C. You should open a defect report providing detailed information on which devices and by running which tests you observed the issue
D. You should not open any defect report and inform the test manager that the devices on which you observed the issue should no longer be supported so that they will be removed from the requirements specification

Answer: C

Explanation:
As a functional tester, you should open a defect report providing detailed information on which devices and by running which tests you observed the issue. A defect report is a document that records the occurrence, nature, and status of a defect detected during testing, and provides information for further investigation and resolution. A defect report should include relevant information such as the defect summary, the defect description, the defect severity, the defect priority, the defect status, the defect origin, the defect category, the defect reproduction steps, the defect screenshots, the defect attachments, etc. Opening a defect report is a good practice for any tester who finds a defect in the software system, regardless of the type or level of testing performed. The other options are not recommended, because:
The issue is related to performance efficiency, not functionality, but that does not mean that as a functional tester, you should not open any defect report as all the functional tests passed. Performance efficiency is a quality characteristic that measures how well the software system performs its functions under stated conditions, such as the response time, the resource utilization, the throughput, etc. Performance efficiency is an important aspect of the user experience, especially for web applications that run on different devices and networks. Even if the functional tests passed, meaning that the software system met the functional requirements, the performance issue observed on some devices could still affect the user satisfaction, the usability, the reliability, and the security of the software system. Therefore, as a functional tester, you have the responsibility to report the performance issue as a defect, and provide as much information as possible to help the developers or the performance testers to investigate and resolve it.

NEW QUESTION # 74
......

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