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Unformatted text preview: nt to either:
• merely mention lurking and/or confounding variables without indicating
how they are confounded with the formation of the groups.
• mention a causal factor which is a treatment “side effect”, e.g. that walkers
may contain plastics which are toxic to children. 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
Question 4 continued Scoring
Part (a) is evaluated based on the four parts of the test. Each part must be
COMPLETELY correct (except for minor arithmetical errors in part 3) to consider the
part correct.
Part (b) is either correct or incorrect. If a student just answers “no” without giving a
correct explanation that relates to the design of the study, part (b) is incorrect.
Note: A 1sided test can earn, at most, a score of 3.
4 Complete Response
All four parts of the hypothesis test in part (a) correct and part (b) correct. (4E)
(4 parts correct in (a)  Correct in (b)) 3 Substantial Response
All four parts of the hypothesis test in part (a) correct and part (b) incorrect (4I)
OR
Three parts of the hypothesis test in part (a) correct and part (b) correct. (3E) 2 Developing Response
Two parts of the hypothesis test in part (a) correct and part (b) correct. (2E)
OR
Three parts of the hypothesis test in part (a) correct and part (b) incorrect. (3I)
Note: For papers judged a 2 because a onetailed test is done and assumptions are not
checked, exceptionally strong answers to the rest of the problem can be used to
score the paper a “holistic” 3. 1 Minimal Response
Two parts of the hypothesis test in part (a) correct and part (b) incorrect (2I)
OR
None or one part of the test in part (a) correct and part (b) correct.
(0E or 1E) 0 No credit
Note that a 1I earns a score of 0. Copyright © 2000 College Entrance Examination Board and Educational Testing Service. All rights reserved.
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This note was uploaded on 09/06/2013 for the course MATH AP Statist taught by Professor Mosby during the Spring '13 term at Silverton High School, Silverton.
 Spring '13
 Mosby
 Statistics, AP Statistics

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