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To calculate the confidence limits for a measurement variable, multiply the standard error of the mean times the appropriate t-value. The t-value is determined by the probability (0.05 for a 95% confidence interval) and the degrees of freedom (nâ1).
Calculators. 1  Use this calculator to determine a confidence interval for your sample mean where you are estimating the mean of a population characteristic (e.g., the mean blood pressure of a group of patients). 2  The estimate is your âbest guessâ of the unknown mean and the confidence interval indicates the reliability of this estimate.