Part 1 states correct hypotheses h0 the distribution

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Unformatted text preview: mean number of lab classes in 2000 is different than it was in 1990. Part (b): Answers question about (a): The test in (a) does not answer this question because the distributions could be different even though the means are the same. Part 1: States correct hypotheses. H0: The distribution of number of lab classes is the same in 2000 as it was in 1990. Ha: The distribution of number of lab classes is not the same in 2000 as in 1990. Copyright © 2002 by College Entrance Examination Board. All rights reserved. Advanced Placement Program and AP are registered trademarks of the College Entrance Examination Board. 19 AP® STATISTICS 2002 SCORING GUIDELINES (Form B) Question 6 (cont’d.) Part 2: Identifies the correct test (by name or by formula) and checks (not just lists) appropriate assumptions. (observed - exp ected )2 Chi-square test (of homogeneity): χ 2 = å exp ected Conditions: Sample size is large. To check, must compute the expected counts: 1990 Expected 24 67 59 19 21 10 2000 Expected...
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