Which of the following statements are true for reliabilty of a measuring instrument? A. It is fixed for…
In classical test theory, the reliability of a measuring instrument is (B) the self-correlation of scores on the instrument with themselves (across parallel forms, halves,…
Choose your answer
Which of the following statements are true for reliabilty of a measuring instrument?
A. It is fixed for a given instrument.
B. It is correlation of scores on measuring instrument with themselves.
C. It varies from sample to sample.
D. Its value can vary from ‐1 to +1.
E. It is affected by size of the sample used for its determination.
Answer and explanation
Correct answer B
In classical test theory, the reliability of a measuring instrument is (B) the self-correlation of scores on the instrument with themselves (across parallel forms, halves, or occasions), (C) not an immutable constant of the test alone, as it varies from sample to sample depending on group heterogeneity, and (E) influenced by the size and representativeness of the sample used to estimate it.
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