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ISQI CTFL_Syll_4.0 New Dumps Ppt | CTFL_Syll_4.0 Test Tutorials

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ISQI ISTQB Certified Tester Foundation Level (CTFL) v4.0 Sample Questions (Q165-Q170):

NEW QUESTION # 165
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 22 person hours and 38 person hours
B. The final estimate is exactly 30 person hours because the technique uses the arithmetic mean of the three initial estimates as the final estimate
C. The final estimate is between 6 person hours and 54 person hours
D. The final estimate is exactly 30 person hours because the technique uses the initial most likely estimate as the final estimate

Answer: A

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.
References: ISTQB Certified Tester Foundation Level Syllabus v4.01, Section 2.3.2, page 24-25; ISTQB Glossary v4.02, page 33.

NEW QUESTION # 166
Which ONE of the following work products TYPICALLY belongs to test execution?

A. A list of test conditions prioritized during test analysis.
B. A test plan that describes the test strategy and test objectives.
C. Automated test scripts used for test execution.
D. Test logs that document the results of test execution.

Answer: D

Explanation:
Test execution involves running test cases and documenting results. Test logs (A) provide evidence of executed tests, failures, and actual outcomes. Automated test scripts (B) are part of test implementation, test plans (C) belong to test planning, and test conditions (D) are identified during test analysis.
Reference:ISTQB CTFL v4.0 Syllabus, Section 1.4.1 - Test Execution

NEW QUESTION # 167
The following state transition diagram describes the behavior of a control system in terms of its possible modes of operation. The initial start state will be the "NORMAL MODE".

Which ONE of the following test cases covers an INVALID sequence?

A. NORMAL MODE # DIAGNOSTIC MODE # DEGRADED MODE # EMERGENCY MODE #
DIAGNOSTIC MODE # NORMAL MODE # DEGRADED MODE
B. NORMAL MODE # DEGRADED MODE # NORMAL MODE # DIAGNOSTIC MODE #
DEGRADED MODE # EMERGENCY MODE # DIAGNOSTIC MODE
C. NORMAL MODE # DIAGNOSTIC MODE # DEGRADED MODE # EMERGENCY MODE #
DIAGNOSTIC MODE # NORMAL MODE # DIAGNOSTIC MODE
D. NORMAL MODE # DIAGNOSTIC MODE # NORMAL MODE # EMERGENCY MODE #
DIAGNOSTIC MODE # NORMAL MODE

Answer: B

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
This question applies theState Transition Testingtechnique.
Let's evaluateOption Dstep-by-step:
* NORMAL MODE # DEGRADED MODE:#Valid on"FAILURE DETECTED"
* DEGRADED MODE # NORMAL MODE:#Valid on"ALL FAILURES CLEARED"
* NORMAL MODE # DIAGNOSTIC MODE:#Valid on"SELF DIAGNOSTIC INITIATED"
* DIAGNOSTIC MODE # DEGRADED MODE:#Invalid- there isno defined transitionfrom DIAGNOSTIC MODE directly to DEGRADED MODE.
According to the state diagram, DEGRADED MODE can only be entered:
* From NORMAL MODE (on FAILURE DETECTED), or
* Not from DIAGNOSTIC MODE at all.
This violates the rule:
"State transition testing uses a model where test cases are designed to execute valid and invalid transitions." (ISTQB CTFL Syllabus v4.0, Section 4.2.4 - State Transition Testing, Page 40) Thus, OptionDcontains aninvalid transition, making it the correct answer.

NEW QUESTION # 168
The following chart represents metrics related to testing of a project that was competed. Indicate what is represented by tie lines A, B and the axes X.Y

Answer: B

Explanation:
Option D correctly explains what is represented by the lines A, B and the axes X, Y in a testing metrics chart. According to option D:
X-axis represents Time
Y-axis represents Count
Line A represents Number of open bugs
Line B represents Total number of executed tests
This information is essential in understanding and analyzing the testing metrics of a completed project.

NEW QUESTION # 169
Which of the following statements is CORRECT about the value added by a tester to release planning?

A. The tester breaks down user stories into smaller testing tasks
B. The tester estimates the testing effort for individual iterations
C. The tester assesses the testability of the user stories
D. The tester writes acceptance criteria

Answer: C

Explanation:
During release planning, a tester adds value by assessing the testability of user stories. This involves evaluating whether the user stories are clear, concise, and testable. The tester ensures that the acceptance criteria are well-defined and that the stories can be effectively tested within the given timeframe.
References:
* ISTQB CTFL Syllabus V4.0, Section 5.1.2 on the tester's contribution to iteration and release planning, which includes assessing the testability of user stories.

NEW QUESTION # 170
......

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