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Cronbach's alpha coefficient is a statistical test allows for checking the rigor and the correlation between the observed variables. This involves two aspects is the relationship between ourselves and the correlation variables of the scores of each variable with all variable scores of each respondent.
This method allows the analyst to eliminate inconsistent and variable limiting junk variable in the model study because otherwise we can not know exactly as well as the variability of the variable errors. Accordingly, the only variables that have correlation coefficients total matching variable (Corrected Item-Total Correlation) greater than 0.3 and scales greater than 0.6 Alpha coefficients to be considered acceptable and appropriate inclusion in the analysis of The next step (Nunnally, 1978; Peterson, 1994; Slater, 1995; Take you and Chu Hoang Trong Nguyen Mong Ngoc, 2008). According to many researchers, Cronbach's alpha reached if 0.8 or more, the scale of measurement is good and the correlation will be higher. Looking at the statistics table below, we can see the results of the reliability analysis as follows:
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