1. A range of values derived from sample statistics that is likely to contain the true population parameter with a specified level of confidence
The 95% confidence interval for the mean is between 10 and 15.
O intervalo de confiança de 95% para a média está entre 10 e 15.
2. A statistical measure used in hypothesis testing and estimation to express uncertainty about a point estimate
We calculated a 90% confidence interval for the proportion of voters who support the candidate.
Calculamos um intervalo de confiança de 90% para a proporção de eleitores que apoiam o candidato.