A percentile score of 50 on an achievement test indicates th

A percentile score of 50 on an achievement test indicates that ?

A. half the norm group had lower scores.

B. half the items were marked correctly.

C. the raw score is at least 50.

D. this person failed the test.

A student in grade 6 earned a raw score of 50 on an achievement test. Which of the following

interpretations is most justified?

A. The grade equivalent score is 6.0.

B. The percentage-correct score is 50.

C. The percentile score is 50.

D. The score cannot be interpreted without more information.

Solution

1)

The 50 percentile score in the achievement test indicates that the person has got as much as or more than 50% of the norm population.

So, half the norm had lower score.

So, option (A) is correct.

-----------------------------------------------------------------------

2)

The raw score doesn\'t guarantee about the percentile of the student as the percentile depends on the data of each and every student in the norm population. So, assuming the total score to be 100, we can say that the student percentage-correct score is 50.

So, option (B) is correct.