การทดสอบความน่าเชื่อถือสอดคล้องภายในในรูปแบบสุดท้ายจะทำโดยใช้การวิเคราะห์อัลฟาครอนบาคของ.
Overall Cronbach’s alpha analysis shows that the instrument is at a high internal consistency which is 0.939. The
value obtained is almost as similar as the one obtained by Marsh (1982), Marsh and Roche (1993) and Al-Hinai
(2011). On the other hand, Cronbach’s alpha analysis which is done separately for each construct shows quite a
different value than the overall value. These differences are the result of the Cronbach’s alpha index that is
influenced by number of items in a single scale. Therefore, Pallant (2011) suggested that the 0.7 alpha index
value or higher is better for a scaled instrument that has ten or more items. On the other hand, a 0.5 alpha value
is good for a less than ten items scaled instrument. The alpha value of each construct in this instrument is
considered as very good since they are higher than 0.735 with only 2 to 4 items