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.

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Definitions:

T Value

A value calculated in a t-test that assesses the difference between two means relative to the variation in the data.

Critical Value

The threshold or point on the test distribution that is compared with the test statistic to determine whether to reject the null hypothesis.

T Value

A statistic used in hypothesis testing to determine if there is a significant difference between two groups.

Test Statistic

A value calculated from sample data that is used in a hypothesis test to determine whether to reject the null hypothesis.