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Reliability of the scale was assessed by the coefficient of Cronbach's Alpha, through which the variables inappropriate will be removed if the correlation coefficient variables - total less than 0.3 and the scale will be accepted when the coefficients Cronbach's Alpha greater 0.6 (Nunnally and Burnstein, 1994) (to be quoted by Nguyen Dinh Tho and Nguyen Thi Mai Trang, 2007). [10]
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