An Instrument That Measures Mathematics Knowledge, Reading Comprehension, and Computation

question 104

Multiple Choice

An instrument that measures mathematics knowledge, reading comprehension, and computation skills provides four measures, one score for each scale and an overall score. Which of the following is likely regarding the properties of the scores?

• A) The reliabilities of the individual scores are lower than the overall score.
• B) The reliabilities of the individual scores are higher than the overall score.
• C) The reliability of the overall score is the average of the reliabilities of the individual scores.
• D) The reliability of the overall score is the sum of the reliabilities of the individual scores.

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