The "20" and "21" in KR-20 and KR-21 represent
A) numbers held constant in the denominator.
B) numbers held constant in the numerator.
C) the order in which the formulas were created.
D) the age of Fred Kuder's sons when the formulas were developed.

Question

Quizplus · Accepted Answer

The "20" and "21" in KR-20 and KR-21 do not represent constants in mathematical terms, the order of creation, or personal details about the developer's family. Instead, they are part of the names of the formulas, Kuder-Richardson Formula 20 and Kuder-Richardson Formula 21, which are used for assessing the reliability of dichotomously scored tests. The numbers do not have a mathematical or personal significance in the context of the formulas' applications or development history.

The "20" and "21" in KR-20 and KR-21 Represent