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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).
Microsoft Excel, a spreadsheet computer program, offers a formula called CONFIDENCE to calculate the confidence interval. The interval represents the range from the survey value in which the true proportion is likely to exist.nter the standard deviation in cell A2. For example, if your standard deviation equals 1.1, enter 1.1 in cell A2. Enter the sample size in cell A3. For example, if your sample size equals 3,000, enter 3,000 in cell A3.