Or 3 the minimum value is only 128 standard

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Unformatted text preview: normal distribution. OR 3. The minimum value is only 1.28 standard deviations below the mean, which is smaller than would be expected for a normal distribution. OR 4. The maximum is only 1.63 standard deviations above the mean, which is smaller than would be expected for a normal distribution. Normality is reasonable: A boxplot shows that the distribution is not too skewed. 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 2 continued 4 Complete Response States both assumptions correctly in part (a). Justifies that the random sample assumption is not met and justifies whether or not the normality assumption is met. 3 Substantial Response States both assumptions correctly and provides a correct discussion of only one of the assumptions. 2 Developing Response States only one of the assumptions correctly in part (a) and provides a correct discussion regarding whether or not it is met in part (b). 1 Minimal Response States one or both of the assumptions correctly in part (a) but does not provide an adequate discussion of either assumption in part (b) 0 No credit NOTES: • Stating only “random sample” or “SRS” is insufficient. • Assumption 2 is normality, not “no outliers.” Stating only that “there are no outliers” is insufficient for establishing normality. • Extraneous comments in either parts (a) or (b) should be ignored, as long as they are not contradictory to the given answer. • If part (b) is addressed in the student’s answer to (a) and not contradicted in what is written in (b), credit can be given for (b). • If part (a) is addressed in the student’s answer to (b) and not contradicted in what is written in (a), credit can be given for (a). • A student can only be penalized once for failing to correctly identify the target population of interest: adults who use the cave. Copyright © 2000 College Entra...
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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.

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