What is the purpose of determining an instrument's internal consistency?
a. It establishes face validity.
b. It demonstrates that the instrument is measuring exactly what the researcher thinks it is measuring.
c. It decreases measurement error.
d. It is a way of establishing test-retest reliability.
ANS: D
Tests of instrument internal consistency or homogeneity, used primarily with paper-and-pencil tests or scales, address the correlation of various items within the instrument. The original approach to determining internal consistency was split-half reliability. This strategy was a way of obtaining test-retest reliability without administering the test twice.
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