# statictics

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According to classical test theory, if the observed variance of a test is 50 and the true variance is 40, what is the estimated reliability of the test?
a.
0.40
b.
0.50
c.
0.80
d.
0.90

• statictics -

The ratio of true score variance to the observed score variance: 40/50 = 0.80

• statictics -

0.80

• statictics -

The ABC Self-Concept Inventory has a split-half reliability coefficient of 0.90, and the XYZ Self-Concept Inventory has a Spearman-Brown reliability coefficient of 0.90. If all other factors are equal, which instrument would you choose to use?

• statictics -

Either one

• statictics -

0.40

• statictics -

90

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