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Unformatted text preview: tion is missing or shows no understanding of independence, then it should
be regarded as incorrect.
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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