If a Test That Has Reliability R Is Lengthened by a Factor

question 54

Multiple Choice

If a test that has reliability r is lengthened by a factor , the reliability R of the new test is given by ​ ​
​If the reliability is r = 0.5, the equation becomes . When the test length is unchanged, the reliability r = R(1) = 0.5. If the length of the test is doubled, the reliability r = R(2) . What percent improvement is there in the reliability when the test length is doubled?
​

• A) 25.0%
• B) 33.3%
• C) 75.0%
• D) 66.7%
• E) 16.7%

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Definitions:

Cervical Region

The upper part of the spine, consisting of the first seven vertebrae that form the neck.

Parietal Bones

Two bones forming the sides and roof of the cranium, each positioned on either side of the skull just behind the frontal bone.

Symphysis Pubis

A type of cartilaginous joint located between the left and right pubic bones near the front of the pelvis, providing slight movement and shock absorbtion.

Sacrum

A triangular bone at the base of the spine, formed by the fusion of several vertebrae and connecting the spine to the pelvis.