The statistics by age and sex in table 2 are generally subject to smaller samling variability than would be indicated by reference to tables F and G. The eductions are particularly large for estimates amounting to a substantial part of the total population in the specific age-sex category (for example, the number f males in the labor force in most age groups). For estimates comprising small proportions of the total population (such as the unemployed or certain categories f the group not in the labor force) the standard errors in tables F and G contitute satisfactory approximations.

The reliability of an estimated percentage, computed by using sample data or both numerator and denominator, depends upon both the size of the percentge and the size of the total upon which the percentage is based. Estimated perentages are relatively more reliable than the corresponding absolute estimates f the numerator of the percentage, particularly if the percentage is large (50 ercent or greater).

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