Answer Happy

Rather than being divided into 100 parts, as in the case of percentiles, a distribution is sometimes divided into 9 parts called stanines, a contraction of the term standard nine. Stanines are whole numbers numbered from a low of 1 to a high of 9, with 5 representing average performance. The stanines that correspond to the percentile intervals are shown in the following graph. Average Below Average Above Average Poor Superior 4% 7% 12% 17% 20% 17% 12% 7% 4% Stanine 3 4 5 6 7 9 Percentile 23 40 60 77 89 96 a. Determine the stanine for the 25th percentile. b. The following Stanford Achievement Test chart records a stanine score beside each percentile. For example, under Math Comp, the 54th percentile corresponds to a stanine score of 5. Determine the student's national spelling stanine score missing from that chart. Stanine score: Stanford ACHIEVEMENT TEST MATH COMP SCORE TYPE GR 4 NORMS GR 4.8 RS/NO POSS 29/44 SEAT

Percentlle 4 23 40 60 89 a. Determine the stanine for the 25th percentile. b. The following Stanford Achievement Test chart records a stanine score beside each percentile. For example, under Math Comp, the 54th percentile corresponds to a stanine score of 5. Determine the student's national spelling stanine score missing from that chart. Stanine score: Stanford ACHIEVEMENT TEST SCORE TYPE MATH COMP GR 4 NORMS GR 4.8 LEVEL INTER 1 FORM E STUDENT NO 400000044 OTHER INFO TEST DATE 5/10/99 RSINO POSS NAT'L PR-S LOCAL PR-S GRADE EQUIV 29/44 54 - 5 68 - 6 AGE 9-6 SPELLING LANGUAGE READING COMP VOCAB- ULARY MATH APPL 32/36 32740 37140 40753 57/60 96 - 9 78 - 7 69 6.4 5.4