WIAT3 Tech Manual.pdf - CAMPBELA

Appendix F 479Table F.2WISC–IV Critical Values and Base Rates: Differences Between Predicted and Actual Achievement Subtest andComposite Standard Scores Required for Statistical Significance and Differences Obtained by Various Percentagesof Students 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 8.28 10.91 29 21 16 13VCI 8.54 11.24 31 22 17 14PRI 8.22 10.82 34 24 19 15Spelling FSIQ 7.38 9.72 27 19 15 12VCI 7.64 10.05 30 21 17 14PRI 7.37 9.70 32 23 18 15Math Fluency—Addition FSIQ 11.65 15.33 31 22 17 14VCI 11.54 15.19 34 24 19 16PRI 11.61 15.28 34 24 19 15Math Fluency—Subtraction FSIQ 10.55 13.89 30 21 17 14VCI 10.40 13.69 34 24 19 15PRI 10.57 13.91 33 24 19 15Math Fluency—Multiplication FSIQ 9.55 12.57 32 23 18 15VCI 9.47 12.47 34 24 19 16PRI 9.46 12.45 35 25 19 16WIAT–IIICompositesWISC–IVScoresCritical Value pBase Rate.05 .01 ≤1% ≤5% ≤10% ≤15%Oral Language FSIQ 9.61 12.65 24 17 13 11VCI 10.16 13.37 25 18 14 12PRI 10.05 13.23 29 21 16 13Total Reading FSIQ 6.16 8.11 26 19 15 12VCI 6.63 8.73 29 20 16 13PRI 6.13 8.07 32 23 18 15Basic Reading FSIQ 5.25 6.91 28 20 15 13VCI 5.50 7.24 31 22 17 14PRI 5.17 6.81 33 23 18 15Reading Comprehension and Fluency FSIQ 8.45 11.13 27 19 15 12VCI 9.00 11.85 28 20 15 13PRI 8.36 11.01 33 23 18 15Written Expression FSIQ 7.99 10.52 26 19 15 12VCI 7.99 10.52 31 22 17 14PRI 8.04 10.58 32 23 18 15Mathematics FSIQ 7.48 9.84 25 18 14 12VCI 7.43 9.78 31 22 17 14PRI 8.10 10.67 29 21 16 13Math Fluency FSIQ 7.69 10.12 30 21 17 14VCI 7.48 9.84 34 24 19 15PRI 7.68 10.11 34 24 19 15Total Achievement FSIQ 5.89 7.76 20 15 12 9VCI 6.31 8.31 27 19 15 12PRI 6.31 8.30 29 21 16 13Note. FSIQ = Full Scale IQ, VCI = Verbal Comprehension Index, PRI = Perceptual Reasoning Index.a Supplemental scores.Copyright © 2009 NCS Pearson, Inc. Normative data copyright © 2009 NCS Pearson, Inc. All rights reserved.