A test of attention span has a reliability coefficient of .84.The average score on the test is 10,with a standard deviation of 5.Lawrence received a score of 64 on the test.We can be 95% sure that Lawrence's "true" attention span score falls between
A) 63 and 65.
B) 62 and 66.
C) 60 and 68.
D) 54 and 74.

Question

Quizplus · Accepted Answer

Lawrence's score of 64 is significantly higher than the average score of 10, suggesting a potential error in measurement or an outlier. The reliability coefficient of .84 indicates that the test is fairly reliable, but not perfect. The range provided in option D, 54 to 74, offers a wide enough margin to account for the standard deviation and the reliability of the test, suggesting that while Lawrence's observed score is 64, his true score could reasonably vary within this broader range, taking into account the potential for measurement error and the test's reliability.

A Test of Attention Span Has a Reliability Coefficient of .84.The