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 = 0.6, the equation becomes . When the test length is unchanged, the reliability r = R(1) = 0.6. 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)20.0%
B)25.0%
C)80.0%
D)75.0%
E)15.0%

Question

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 = 0.6, the equation becomes  . When the test length is unchanged, the reliability r = R(1) = 0.6. 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)20.0% 
B)25.0% 
C)80.0% 
D)75.0% 
E)15.0%

Quizplus · Accepted Answer

The Answer of 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 = 0.6, the equation becomes  . When the test length is unchanged, the reliability r = R(1) = 0.6. 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)20.0% 
B)25.0% 
C)80.0% 
D)75.0% 
E)15.0%

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