Posted by **Joyce** on Sunday, October 27, 2013 at 10:44am.

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?

Answer

a.

0.40

b.

0.50

c.

0.80

d.

0.90

- statictics -
**MathGuru**, Sunday, October 27, 2013 at 8:02pm
The ratio of true score variance to the observed score variance: 40/50 = 0.80

- statictics -
**Anonymous**, Saturday, April 25, 2015 at 8:06am
0.80

- statictics -
**liz**, Sunday, April 26, 2015 at 10:23pm
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?

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