1nd Edition CJUS K300 Lecture 19 Outline of Last Lecture I ANOVA Outline of Current Lecture II ANOVA cont Current Lecture New Equations Tukey s Honest Significant Difference Test HSD which is necessary if you reject the null hypothesis SSwithin d f within CD q nk To find q you need to have the alpha level the d f within and k eta 2 SS between SS total Example Research question Do girls who hang around mostly boys boys and girls or mostly girls have more frequency of delinquent acts Mostly Boys x 2 Boys Girls x 2 x Mostly Girls 5 25 7 49 2 4 8 64 5 25 3 9 9 81 4 16 0 0 4 16 9 81 3 9 7 49 6 36 1 1 10 100 4 16 3 9 6 36 7 49 2 4 2 These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute 49 371 42 272 14 36 H o u1 u2 u 3 H o u1 u2 u3 alpha 05 always SStotal 679 d f between 3 1 2 11025 154 21 d f within 21 3 18 SSbetween 492 422 14 2 525 98 7 7 7 SSw 154 98 56 98 2 obt 15 8 56 18 F 15 8 3 55 so we reject the null which says that there is no difference which means that we need to calculate the extent to which this is true through the HSD tukeys honesty Take the means of each group and subtract them from the other one then compare the ABSOLUTE VALUE no negatives to the CD 56 18 CD 3 61 2 4 7 H o uboys uboys girls H i u boys uboys girls 7 6 1 2 4 fail to reject the null H o uboys u girls 7 2 5 2 4 reject the null H i u boys ugirl s H o uboys girls u girls 6 2 4 2 4 reject the null H i u boys girls u girls Conclusion ub ubg u g 95 certain that in this population girls friends with boys or boys and girls commit more delinquent acts than girls only friends with girls eta 2 98 64 154 The eta 2 indicates the intensity of the relationship between the independent and dependent variables 65 of the variance in frequency in delinquent activity is explained by the gender of a girls friends in this population
View Full Document
Unlocking...