Software-quality

Question 1
Statistical software quality assurance in software engineering involves __________ .
A
using sampling in place of exhaustive testing of software.
B
surveying customers to find out their opinions about product quality.
C
tracing each defect to its underlying cause, isolating the vital few causes, and moving to correct them.
D
tracing each defect to its underlying causes, and using the Pareto principle to correct each problem found.
Question 1 Explanation: 
→ Statistical software quality assurance in software engineering involves tracing each defect to its underlying cause, isolating the vital few causes, and moving to correct them.
→ Statistical software quality assurance uses pareto principle to identify vital causes (80% of defects can be traced to 20% of causes) and moves to correct the problems that have caused the defects.
Question 2
A signal processor software is expected to operate for 91.25 days after repair, and the mean software repair time is expected to be 5 minutes. Then, the availability of the software is:
A
96.9862%
B
97.9862%
C
98.9962%
D
99.9962%
Question 2 Explanation: 
Given data,
-- Software expected to operate after repair(MTBF) = 91.25 days
= 91.25 * 24 hours
= 2190 hours
-- Mean software repair time(MTTR) = 5 mins
= 5/60 hrs
= 0.083 hrs
-- Software Availability=?
Step-1: Software Availability =MTBF / (MTBF + MTTR)
= [2190 / (2190 + 0.083)]*100
= (2190 / 2190.083)*100
= 0.9996211481 * 100
= 99.9962%
Question 3
Given below are two statements: Statement I: Quality control involves the series of inspections, reviews and tests used throughout the software process, to ensure each work product meets the requirements placed upon it. Statement II: Quality assurance consists of auditing and reporting functions of management. In the light of the above statements, choose the correct answer from the option given below
A
Both Statement I and Statement II are true
B
Both Statement I and Statement II are false
C
Statement I is correct but Statement II is false
D
Statement I is incorrect but Statement II is true
Question 3 Explanation: 
Quality control: Quality control involves the series of inspections, reviews, and tests used throughout the software process to ensure each work product meets the requirements placed upon it. Quality control includes a feedback loop to the process that created the work product. The combination of measurement and feedback allows us to tune the process when the work products created fail to meet their specifications.This approach views quality control as part of the manufacturing process.Quality control activities may be fully automated, entirely manual, or a combination of automated tools and human interaction. A key concept of quality control is that all work products have defined, measurable specifications to which we may compare the output of each process. The feedback loop is essential to minimize the defects produced.
Quality Assurance: Quality assurance consists of the auditing and reporting functions of management. The goal of quality assurance is to provide management with the data necessary to be informed about product quality, thereby gaining insight and confidence that product quality is meeting its goals. Of course, if the data provided through quality assurance identify problems, it is management’s responsibility to address the problems and apply the necessary resources to resolve quality issues.
There are 3 questions to complete.

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