Collecting Performance Measurements and Metrics CT-PT Practice Questions (Page 4)

Questions 16–20

1. 16foundation · easy

   During a performance test, the tester records the number of transactions completed per second and the percentage of CPU time used by the server. Which two types of performance measurements are these?

   • AThroughput and resource utilization
   • BResponse time and throughput
   • CResource utilization and error rate
   • DError rate and response time
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2. 17foundation · easy

   For a system that is an e-commerce website, which metric would be most relevant to measure the user-perceived speed of the checkout process?

   • AMemory utilization
   • BError rate
   • CResponse time
   • DThroughput
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4. 18foundation · easy

   Which of the following is a common method for collecting performance measurements during a load test?

   • AManually observing the application's user interface and noting any delays
   • BUsing a load testing tool that records response times and throughput for each virtual user
   • CReviewing the application's source code to estimate performance
   • DAsking users to report their experience after the test
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5. 19expert · hard

   A performance test engineer is analyzing results from a load test. The average response time is 2 seconds, but the 99th percentile is 15 seconds. The engineer suspects a 'tail latency' problem. To investigate, the engineer needs to determine if the slow responses are caused by a specific transaction or by a general system issue. Which data collection approach is most effective?

   • AIncrease the test duration to collect more data points
   • BCalculate the standard deviation of the response times for the entire test run
   • CAnalyze response time breakdowns by transaction name and correlate with server-side resource utilization spikes
   • DRe-run the test with a single virtual user to see if the tail latency disappears
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6. 20application · medium

   A performance test report shows that the average response time for a login transaction is 1.5 seconds, but the 90th percentile is 4.8 seconds. Which interpretation of these metrics is most accurate?

   • AMost users experience a good response time, but a significant minority (10%) experience a much slower response, indicating a variability problem
   • BThe system is performing well because the average is under 2 seconds
   • CThe average is incorrect because the 90th percentile is higher
   • DAll users experience a response time between 1.5 and 4.8 seconds
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