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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 Spring '13
 Mosby
 Statistics, Normal Distribution, Standard Deviation, AP Statistics, Statistical hypothesis testing, College Entrance Examination Board, college entrance examination, Entrance Examination Board

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