The Kuder-Richardson 21 Formula for Estimating the Score Reliability of a Classroom

question 27

Multiple Choice

The Kuder-Richardson 21 formula for estimating the score reliability of a classroom achievement test has the disadvantage that

• A) it is difficult to compute.
• B) it assumes that all test items are of equal difficulty.
• C) it is inappropriate for a power test.
• D) the resulting reliability coefficient must be adjusted by using another formula.

---

Definitions:

Flatness

The degree to which a surface adheres to a perfectly flat plane, with minimal deviation.

Surface Elements

The basic visual and tactile aspects of a physical surface, including texture, smoothness, and other topographical features.

Symbol

A hallmark, icon, or language that points to, mirrors, or is accepted as indicating a perception, material, or affinity.

Circularity

A geometric term referring to the attribute of a shape being round, measured typically by how much a part deviates from a perfect circle.