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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).
The following statements produce confidence limits for the mean, standard deviation, and variance of the population of heights: title 'Analysis of Female Heights'; ods select BasicIntervals; proc univariate data=Heights cibasic; var Height; run; The CIBASIC option requests confidence limits for the mean, standard deviation, and variance. For example, Output 4.9.1 shows that the 95% confidence interval for the population mean is . The ODS SELECT statement restricts the output to the BasicIntervals table; see the section ODS Table Names.