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( convergent validity) (

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alpha Cronbach.

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(alternative-forms reliability or parallel-forms reliability)

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(split-half reliability):

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:1. a=0,90

2. r (Pearson coefficient)=0,90 test-retest3. a=0,90

DeVellis, R. (2003) Scale Development: Theory and Application, London: Sage Plublications.

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