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Unformatted text preview: t test and pooled variance. Use a 5% level of significance. What can you say about the pvalue of this test? ( ) ( ) 2 1 1 2 1 2 2 2 2 1 1 2 pooled++= n n s n s n s To test H : 1 2 = Assumptions: 1) Both populations are normal. 2) The population standard deviations are equal. Test Statistic: t = ( ) 2 1 pooled 2 1 1 1 & n n s y y + . n 1 + n 2 2 degrees of freedom The t Distribution r t 0.40 t 0.25 t 0.10 t 0.05 t 0.025 t 0.01 t 0.005 12 0.259 0.695 1.356 1.782 2.179 2.681 3.055 c) Test for difference in the average heights for these two groups using the ANOVA F test. Use a 5% level of significance. What can you say about the pvalue of this test? ANOVA table: Source SS DF MS F Between Within Total The F Distribution v 1 v 2 1 = 0.10 12 3.18 = 0.05 4.75 = 0.01 9.33...
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This note was uploaded on 04/29/2010 for the course STAT stat 420 taught by Professor Stepanov during the Spring '07 term at University of Illinois at Urbana–Champaign.
 Spring '07
 STEPANOV

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