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Unformatted text preview: veloping Response
Both parts are partially correct.
Part (a) is essentially correct and part (b) is correct. 1 Minimal Response
Part (a) is partially correct and part (b) is incorrect.
Part (a) is incorrect and part (b) is essentially or partially correct.
NOTE: PP is between a 1 and a 2. If only the before and after design is present,
it will be rounded down to a 1. Copyright © 2002 by College Entrance Examination Board. All rights reserved.
Advanced Placement Program and AP are registered trademarks of the College Entrance Examination Board. 11 AP® STATISTICS
2002 SCORING GUIDELINES (Form B)
Large sample confidence interval for a population proportion.
Requires large population (N > 20n) and large sample. Can consider sample large since
np = 1026(.39) = 400.14 ³ 10, n(1 - p ) = 1026(.61) = 625.86 ³ 10
n p > 5, n(1- p ) > 5 OR ˆ
p (1 - p)
= .39 ± .0298 = (.3602,.4198) is within the interval (0, 1).
n Computation of 95 percent confidence int...
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