A psychologist is interested in 4-year-old Jacob's knowledge of the differences between animals and vehicles. The psychologist gives Jacob a multiple-choice picture test in which he must write the letter of the correct answer on a separate answer sheet. However, Jacob has trouble identifying and writing some letters. On two separate occasions, Jacob receives the same score on the test. This method has _____ validity and _____ reliability.
A) good; good
B) good; poor
C) poor; good
D) poor; poor

Question

Quizplus · Accepted Answer

The fact that Jacob has trouble identifying and writing some letters implies poor validity, as the test seems to be measuring more than just his knowledge of animals and vehicles. However, the fact that he received the same score on two separate occasions suggests good reliability, as it is a consistent measure of whatever the test is measuring. Therefore, the best choice is C, which reflects poor validity but good reliability.

A Psychologist Is Interested in 4-Year-Old Jacob's Knowledge of the Differences