The objectives of this research are to investigate: (1) the correlation between the use of internet and the learning achievement of the students in Grade X of Vocational High School Muhammadiyah 1 of Sragen in Academic Year 2012/2013; (2) the correlation between the learning activeness in peer group and the learning achievement of the students in Grade X of Vocational High School Muhammadiyah 1 of Sragen in Academic Year 2012/2013; and (3) the correlation of the use of internet and the learning activeness in peer group to the learning achievement of the students in Grade X of Vocational High School Muhammadiyah 1 of Sragen in Academic Year 2012/2013. This research used the descriptive quantitative method. The population of the research was all of the students in Grade X of Vocational High School Muhammadiyah 1 of Sragen in Academic Year 2012/2013 as many as 264 students. The samples of the research consisted of 145 students, and they were taken by using the proportional random sampling technique. The data of the research were gathered through questionnaire and documentation. They were then analyzed by using the multiple linear regression analysis. The results of the research are as follows: (1) there is a correlation between the use of internet and the learning achievement of the students in Grade X of Vocational High School Muhammadiyah 1 of Sragen in Academic Year 2012/2013 as indicated by the value of rcount = 0.420 > that of rtable = 0.1371 at the significance level of 5%; (2) there is a correlation between the learning activeness in peer group and the learning achievement of the students in Grade X of Vocational High School Muhammadiyah 1 of Sragen in Academic Year 2012/2013 as shown by the value of rcount = 0.413 > that of rtable = 0.1371 at the significance level of 5%; and (3) there is a simultaneous correlation of the use of internet and the learning activeness in peer group to the learning achievement of the students in Grade X of Vocational High School Muhammadiyah 1 of Sragen in Academic Year 2012/2013 as signified by the value of Fcount = 30.986 > that of Ftable = 3.06 at the significance level of 5%. The multiple linear regression is ? = 51.211 + 0.454 X1 + 0.210 X2. The value of the simultaneous contribution of the independent variables to the dependent variable (R2) = 0.304. The relative contribution of the use of internet to the learning achievement is 50.86%, and that of the learning activeness in peer group to the learning achievement is 49.14%. The effective contribution of the use of internet to the learning achievement is 15.45%, and that of the learning activeness in peer group to the learning achievement is14.93%.
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