# 26 - Comm 228 3-26-08 Practice problems on d2l under...

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Comm 228 3-26-08 Practice problems on d2l under content Have 1 sheet of paper to bring into exam 2 sides: make 1 side formulas, one other stuff Assignment 2.5 due April 4 th MONDAYS NOTES SS is 200 SSb is 50 What is SSw? 200=50+x 150=x SSw is 60 SSb is 60 SSt= 120 I have 12 groups that I am comparing. What is my between groups degree of freedom? 12-1=11 -If comparing more than two groups, the t test is inappropriate -ANOVA= Analysis of Variance -F distribution F=Between groups variance/ within groups variance Components of variability SSt=SSb+SSw

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-not going to ask us to do the sum of squares on the test SSb df: k-1 SSw df: N-K SSb MS: ssb/dfb SSw MS: ssw/dfw F=MSb/MSw 5 groups. 41 each group SSb= 104 SSw=1812 SSt= 1916 DFb= 5-1=4 DFw= 205-5= 200 DFt= 204 MSb=104/4= 26 MSw=1812/200= 9.06 F= 26/9.06= 2.87 Find the critical value of F with 4, 200 df (DFb, DFw) Answer:2.41 -2 questions on quiz is on how to find critical value of f -I had an F of 2.87. That’s greter than 2.41. So im going to reject the null telling me that all groups were equal One-way ANOVA
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## This note was uploaded on 04/02/2008 for the course COMM 228 taught by Professor Kenski during the Spring '08 term at University of Arizona- Tucson.

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26 - Comm 228 3-26-08 Practice problems on d2l under...

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