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Unformatted text preview: mean number of lab classes in 2000 is different than it was in 1990.
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)
(observed - exp ected )2
Chi-square test (of homogeneity): χ 2 = å
Conditions: Sample size is large. To check, must compute the expected counts:
10 2000 Expected...
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