A student of university is interested in assessing

A student of university is interested in assessing

A student of university is interested in assessing

A student of university is interested in assessing a new 20 item scale of optimism pessimism. How should she assess the reliability of this scale? The student is also advised by her instructor to measure several different traits using several different methods to demonstrate empirically the convergent and discriminant validity of the new scale. Why did the instructor give her this advice?

 

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