Abstract
A study was made of relationships between the sampling interval and the estimated accuracy of such statistical values of population as annual mean value and percentile values for one year, both of which are obtained from sampled statistical values in the case of sampling made of air pollution at an equal-time interval.
By the application of the stratified sampling theory to this method of sampling, relationships between the estimated standard errors of some percentile values for the log-normal distribution and the number of samples are calculated and are shown in diagrams, whereby the results were compared with the actual data of errors.
It follows from the results that the calculated standard errors of the percentile values of the sample data shown in the diagrams were slightly overestimated, as compared with the actual data of errotr.
It is suggested, however, that these diagrams may be used in choosing the sampling time duration in the intermittent sampling procedure at an equal-time interval.
