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Or since the confidence interval from part a for the

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Unformatted text preview: wanted major change, 19 percent wanted a complete overhaul of the system. These two groups combined represent 58 percent (more than half) of the sample. OR Since the confidence interval from part (a) for the percentage of all U.S. adults who would respond “make some major changes” includes 41 percent, we can’t conclude that the two population percentages are different. OR The advocate is claiming that we should not change the system on the basis of adding the 30 percent who want to make some minor adjustments to the 11 percent who want to leave the system the way it is now. It is misleading to claim that these 30 percent don’t want to change the system. Copyright © 2002 by College Entrance Examination Board. All rights reserved. Advanced Placement Program and AP are registered trademarks of the College Entrance Examination Board. 13 AP® STATISTICS 2002 SCORING GUIDELINES (Form B) Question 4 (cont’d.) Scoring There are four parts to this question. You should read (2) and (3) together. 1. Determining the 95 percent confidence interval is Essentially correct if it • identifies the large sample confidence interval for a po...
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