Discuss how the range of individual differences might affect the size of a reliability estimate.
What will be an ideal response?
The size of a reliability estimate will vary with the range of individual differences in the group. That is, as the variability of the scores increases (decreases), the correlation between them also increases (decreases). This is an important consideration in performance measurement. Frequently, the reliability of performance measures is low because of the homogeneous nature of the group in question (e.g., only individuals who are hired and stay long enough to provide performance data are included). Such underestimates serve to reduce or to attenuate correlation coefficients such as interrater reliability coefficients (e.g., correlations between ratings provided by various sources; LeBreton, Burgess, Kaiser, Atchley, & James, 2003) and validity coefficients (e.g., correlations between test scores and performance; Sackett, Laczo, & Arvey, 2002).
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Fill in the blank(s) with the appropriate word(s).
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Answer the following statement true (T) or false (F)