note it is not essentially correct to say the

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Unformatted text preview: of flexibility ratings for middle-aged men "is normal", some qualification must be given, i.e. “approximately Normal”. Partially correct if interpretation is correct but not in context or correct comparison of the two groups is made only on the basis of one of center, shape or spread or correct comparison of the two groups is made on at least two of center, shape and spread but communication is weak. or at least two of the same individual descriptions in both groups (e.g. center and shape) but no direct comparison between the two groups. 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 Incorrect if response fails to compare the two groups on any of center, shape or spread (e.g. only compares the two groups for one value of the flexibility ratings.) If a display that uses the frequencies as data is done in part (a), no credit is given in part (a) (e.g. frequency boxplots, or frequency vs. frequency/ frequency vs. flexibility scatterplots). However, if a student attempts an interpretation, and they do a credible job with the interpretation, part (b) can be scored as partially correct (resulting in a score of 1 for the problem). For example if a student says that there is a “positive linear relationship” or that center, shape and spread are similar because stem and leaf displays of the frequencies look similar, this is a credible interpretation. 4 Complete Response Essentially correct on both parts. 3 Substantial Response Essentially correct on one part and partially correct on the other. 2 Developing Response Essentially correct on one part and incorrect on the other OR Partially correct on both parts 1 Minimal Response Partially correct on one part A paper using the frequencies as data can receive at most a 1. 0 No credit Copyright © 2000 College Entrance Examination Board and Educational Testing Service. All rights reserved. AP is a registered tradem...
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