A correlation coefficient is used in tool development to determine:
a. equivalence of items.
b. reliability.
c. stability.
d. validity.
ANS: B
Reliability exists in degrees and is usually expressed as a form of correlation coefficient, with 1.00 indicating perfect reliability and .00 indicating no reliability.
Equivalence of items is determined with parallel forms reliability.
Test-retest reliability determines stability of an instrument.
Correlation coefficients do not determine validity.
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