confidence interval
B2CEFR level
55/100Rarity: uncommon
TechnicalRegister
A range of values, derived from the data, that is likely to contain the true effect at a stated level of confidence.
The 95% confidence interval for the uplift spanned minus 1% to plus 4%, so we couldn't call it a win.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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