With the cooperation of metropolitan and provincial places of work of education, 더온카지노 two grades had been examined in a single school, one in every of two grades. The schools that rejected the survey had been changed with pilot sample schools that were beforehand extracted from the same stratification. Post-stratification and weighting had been utilized to match the distribution of the samples and the populations after the survey.
With the cooperation of metropolitan and provincial places of work of education, 더온카지노 two grades had been examined in a single school, one in every of two grades. The schools that rejected the survey had been changed with pilot sample schools that were beforehand extracted from the same stratification. Post-stratification and weighting had been utilized to match the distribution of the samples and the populations after the survey.
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