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Noise surveys in this country reported that a large number ofclassrooms in primary and secondary schools in the urban areas were dis-turbed by environmental noise,particulariy by traffic noise.A series ofpsychological tests were conducted to identify pupils’behavior in aclassroom under different noise levels within the range of 40 to 70 dBA.Statistical analysis results were obtained by using Relational Data Analy-sis System(RDAS)software.According to the t-test and single factor vari-ance analysis of the results,significant differences of the pupils’behaviorin the classroom have been observed when the percentile exceeded soundlevel either L_(50) exceeds 50 dBA or L_(10) exceeds 55 dBA,or the equivalentcontinuous sound level L_(eq) exceeds 50 dBA.The same conclusion hasbeen drawn from the average percentages of syllable articulation under different noise levels in a classroom which were the results of tests made inacdordance with the procedure described in the National Standard.Themaximum acceptable noise
Noise surveys in this country reported that a large number ofclassrooms in primary and secondary schools in the urban areas were dis-turbed by environmental noise, particulariy by traffic noise. A series ofpsychological tests were conducted to identify pupils’behavior in aclassroom under different noise levels within the range of 40 to 70 dBA. Statistical analysis results were obtained by using Relational Data Analy- sis System (RDAS) software. According to the t-test and single factor vari-ance analysis of the results, significant differences of the pupils’ behaviorin the classroom have been observed when the percentile exceeded soundlevel either L_ (50) exceeds 50 dBA or L_ (10) exceeds 55 dBA, or the equivalent continuous sound level L_ (eq) exceeds 50 dBA. the same conclusion has bound from the average percentages of syllable articulation under different noise levels in a classroom which were the results of tests made in acordance with the procedure described in the national standard. maxima um acceptable noise