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Advanced Placement Program and AP are registered trademarks of the College Entrance Examination Board. 18 AP® STATISTICS
2002 SCORING GUIDELINES (Form B)
Question 6 (cont’d.)
Part 3: Correct mechanics, including the value of the test statistic, df, and Pvalue (or
rejection region). 1990
2000
t = .751 N
200
200 Mean
1.83
1.93 StDev
1.29
1.37 df = 396 SE Mean
0.091
0.097 Pvalue = .453 (or based on tables Pvalue > .20) Also OK to use conservative df of 199
OR
Calculator using sample statistics:
t = .7515, Pvalue = .4527, df = 396.57
Calculator using raw data
t = .7512, Pvalue = .4529, df = 396.67
OR
use a confidence interval approach:
Difference = mu 1990  mu 2000
Estimate for difference: 0.100
90 percent CI for difference: (0.319, 0.119)
OR
use a “pooled” procedure
t = .751
p=.452
df = 398
OR
if use rejection region, t.05 = + 1.660
Part 4: States a correct conclusion in the context of the problem, linking to the result of
the statistical test.
Because the Pvalue > α, fail to reject H0. There is not convincing evidence that the...
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This note was uploaded on 09/06/2013 for the course MATH AP Statist taught by Professor Mosby during the Spring '13 term at Silverton High School, Silverton.
 Spring '13
 Mosby
 Statistics, AP Statistics

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