Dr. Feng devises a questionnaire to measure adults' extraversion, a stable personality trait. Dr. Feng computes the questionnaire scores of a large sample of adults. Six months later, he gives the same sample the same test. The correlation between the two sets of scores is .10. What can one conclude regarding Dr. Feng's test?
A)It is not reliable.
B)It is reasonably reliable.
C)It is not valid.
D)It is reasonably valid.

Question

Quizplus · Accepted Answer

The low correlation (.10) between the two sets of scores six months apart indicates that the test does not consistently measure what it is supposed to measure over time, suggesting it is not reliable.

Dr Feng Devises a Questionnaire to Measure Adults' Extraversion, a Stable