PSYC 2320: Statisties in Psychological Research Spring 2018 8. Anwer the folowin

Question

PSYC 2320: Statisties in Psychological Research Spring 2018 8. Anwer the folowing questions based on the table given belows which lists percendiles for a. John proudly proclaims that he obtained a "higher" percentile ranking than his friend eight different reference groups. Howard. Investigation of the facts reveals that his score on the test was actually lower Must it be concluded that John was mistaken? Jean obtained a percentile rank of 75 on the social-work scale. What was her score? What score would she have had to obtain to achieve the same percentile rank of the physical sciences scale? b. 81 70 75 61 70 76 74 61 51 46 41 50. 51 37 15 34 41 32 15 10 34 41 26 4 of 8

Explanation / Answer

(a) If John gets a higher percentile rank in the same test as Howards, then necessarily John score in the test must be higher; because to calculate percentile ranks, we first order the scores in ascending order. The higher the score, the higher the percentile rank.

(b) 75 percentile rank in social work scale implies her raw score to be 60.

To get 75 percentile rank in physical sciences, the student must score 80.

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