Case Study: Marcus

Case Study: Marcus Marcus, age 9 years 8 months, is in the fourth grade and is having some academic difficulties in school. He was administered the Stanford Achievement Test, Tenth Edition (Stanford 10). Based on Marcus’ scores on the summary report, answer the following questions: Stanford 10 Student Summary Report National Grade Percentile Bands Subtests and Total    Number Possible    Number Correct    Scaled Score    National PR-S*    National NCE    Grade Equivalent    AAC Range    1    10        30    50    70        90    99 Total Reading    114     82    639    59-5    54.8    5.4    Middle Total Mathematics     80     29    629    22-3    33.7    3.3    Low Language     48     28    610    39-4    44.1    3.5    Middle Spelling     40     30    647    73-6    62.9    6.4    High Science     40     12    619    18-3    30.7    2.8    Low Social Science     40     22    607    40-5    44.7    3.5    Middle Listening     40     22    608    35-4    41.9    3.4    Middle Complete Battery    402    270    NA    56-5    53.4    5.0    Middle *PR-S: Percentile Rank and Stanine 1.    Interpret the percentile ranks (PR) for each of the subtests and total score. 2.    Interpret the stanine scores (S) for each subtest and total score. 3.    Across subtest and total scores, identify Marcus’ relative strengths and weaknesses based on his stanine (S) scores. 4.    The percentile bands provide a graphic display of measurement error. The wider the bands, the more error on the subtests. a.    Which subtest score(s) appear to have the greatest error? b.    Which subtest score(s) appear to have the least error? 5.    Marcus’ grade equivalent score on spelling is 6.4. Based on this score, Marcus’ parents believe he is ready for instruction in spelling at the 6th grade level. Do you agree with this? Why or why not?