WIAT3 Tech Manual.pdf - CAMPBELA

Appendix G 489Table G.2WISC–IV Critical Values and Base Rates: Differences Between Ability and Achievement Subtest and CompositeStandard Scores Required for Statistical Significance and Differences Obtained by Various Percentages ofStudents in the Validity Sample (continued)Ages 6:0–16:11WIAT–IIISubtestsWISC–IVScoresCritical Value pBase Rate.05 .01 ≤1% ≤5% ≤10% ≤15%Oral Reading Rate a FSIQ 9.30 12.24 33 24 19 15VCI 10.60 13.95 36 25 20 16PRI 11.39 14.99 41 29 23 19Spelling FSIQ 8.32 10.95 29 21 16 13VCI 9.75 12.84 34 24 19 15PRI 10.60 13.95 39 28 22 18Math Fluency—Addition FSIQ 12.47 16.42 36 26 20 16VCI 13.47 17.73 43 31 24 19PRI 14.10 18.56 43 30 24 19Math Fluency—Subtraction FSIQ 11.39 14.99 34 24 19 15VCI 12.47 16.42 42 30 23 19PRI 13.15 17.31 41 29 23 18Math Fluency—Multiplication FSIQ 10.60 13.95 38 27 21 17VCI 11.76 15.48 43 31 24 20PRI 12.47 16.42 44 32 25 20WIAT–IIICompositesWISC–IVScoresCritical Value pBase Rate.05 .01 ≤1% ≤5% ≤10% ≤15%Oral Language FSIQ 10.18 13.41 25 18 14 11VCI 11.39 14.99 28 20 15 13PRI 12.12 15.96 32 23 18 15Total Reading FSIQ 7.20 9.48 28 20 16 13VCI 8.82 11.61 32 23 18 15PRI 9.75 12.84 38 27 21 17Basic Reading FSIQ 6.57 8.65 31 22 17 14VCI 8.32 10.95 35 25 20 16PRI 9.30 12.24 40 28 22 18Reading Comprehension and Fluency FSIQ 9.30 12.24 30 21 17 14VCI 10.60 13.95 31 22 17 14PRI 11.39 14.99 40 28 22 18Written Expression FSIQ 8.82 11.61 28 20 16 13VCI 10.18 13.41 36 26 20 16PRI 11.00 14.48 38 27 21 17Mathematics FSIQ 8.32 10.95 28 20 15 13VCI 9.75 12.84 36 26 20 16PRI 10.60 13.95 33 23 18 15Math Fluency FSIQ 8.82 11.61 34 24 19 16VCI 10.18 13.41 42 30 24 19PRI 11.00 14.48 41 29 23 19Total Achievement FSIQ 6.57 8.65 21 15 12 10VCI 8.32 10.95 29 21 16 13PRI 9.30 12.24 33 23 18 15Note. FSIQ = Full Scale IQ, VCI = Verbal Comprehension Index, PRI = Perceptual Reasoning Index.aSupplemental scores.Copyright © 2009 NCS Pearson, Inc. Normative data copyright © 2009 NCS Pearson, Inc. All rights reserved.