Functional performance testing · Question 49 of 60
After 601 test cases, the observed accuracy is 98%. What applies to the measured margin of error at the 95% confidence level?
1 answer is correct. Hard
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Answer
- A It is narrower than ±4%, about ±1.1%, because variance is lower at high accuracy
Explanation
For the 601 cases, the calculation cautiously assumes the worst case: nothing is known yet about the true accuracy; it could lie anywhere between 0% and 100%. If 98% is then actually measured, the margin of error is much narrower than ±4%, about ±1.1%, because results scatter less at such high accuracy.