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Unformatted text preview: tion is missing or shows no understanding of independence, then it should be regarded as incorrect. d. Wife s y=x 80 70 60 50 40 Husband 40 50 60 70 80 Copyright © 2000 College Entrance Examination Board and Educational Testing Service. All rights reserved. AP is a registered trademark of the College Entrance Examination Board. AP® Statistics 2000 ─ Scoring Guidelines Key characteristics of a correct graph: 1. Center of ellipse is at about (70, 65) 2. Size of ellipse: approximately 3 standard deviations from center, i.e. +/- 7.5 from center on Wife axis and +/- 9 from center on Husband axis. 3. Orientation of ellipse--positive slope 4. Small overlap of the y = x line 5. Label the axes Part (d) is Essentially correct if the ellipse drawn meets all 5 of the stated characteristics. Partially correct if the ellipse drawn meets 3 or 4 of the stated characteristics. Scoring PARTIALLY CORRECT RESPONSES COUNT AS ½ AN ESSENTIALLY CORRECT RESPONSE. THAT IS, TWO PARTIALLY CORRECT RESPONSES CAN COUNT AS ONE ESSENTIALLY CORRECT RESPONSE. 4 Complete Response Essentially correct on four parts. 3 Substantial Response Essentially correct on three parts. 2 Developing Response Essentially correct on two parts. 1 Minimal Response Essentially correct on one part. 0 No credit IF A PAPER IS BETWEEN TWO SCORES (FOR EXAMPLE, 2 PARTS ESSENTIALLY CORRECT AND ONE PART PARTIALLY CORRECT, WHICH IS BETWEEN A 2 AND A 3) USE A HOLISTIC APPROACH TO DETERMINE WHETHER TO SCORE UP OR DOWN. Copyright © 2000 College Entrance Examination Board and Educational Testing Service. All rights reserved. AP is a registered trademark of the College Entrance Examination Board....
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