The purpose of this method is to check whether the items are actually asked to contribute to the measurement of theoretical concepts we are studying. The item asked the same measure implicit concept, there must be a relationship with the remaining items in the group / factors.
Coefficient Cronbach's Alpha is allowed statistical tests the level closely that the items asked
in scale relative related to each other. on this basis, the variable correlation coefficient with the total (item-total correlation) below will be disqualified and the criteria for selection of the scale as it ensures reliability Alpha 0.6 or higher . normally, scales Cronbach alpha of 0.7 to 0.8 is used. Many researchers believe that the reliability scale upwards from 0.8 to nearly 1 are good measurement scales. However, in the case of the concept of measuring the amount of new or new to the respondents in the context of the study, the coefficient of Cronbach's Alpha is accepted from 0.6 or higher (Nunnally, 1978; Peterson, 1994; Slater, 1995 ).
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