Test and results
Why a range instead of a single number?
Short answer: Because no test measures without error. The range shows where your result most likely is, with 95% confidence.
With 37 questions, a result can shift a few points up or down just by chance, because of the day, fatigue or one guessed question.
The range shows where your result most likely is, with 95% confidence. The number in the middle is the most likely value.
A test that shows a single number with no margin implies a certainty it doesn't have. Read more in Why an honest result comes with a margin of error.
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