QMS 202 Lecture 6: Lecture 6

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Two samples are independent: the sample selected from one population is not related to the sample selected from p the second population. The two samples are dependent: each member of one sample corresponds to a member of the other sample. Dependent samples are also called paired samples or matched samples. One-way anova for differences among more than two means. Conditions/assumptions: randomness and independence, normality, homogeneity of variance. Variance: compare means of more than two groups, one-way anova, deals with one factor of interest (e. g. performance, salary, etc, analyzing the variation within groups and. Partitioning the total variation : sst = ssa +ssw. Note: n=total number of values in all groups n= n1+n2+n3+ . Ha : not all 2j are equal (j=1,2,3,4) 21= pop average test score for class 1. 22= pop average test score for class 2. 23= pop average test score for class 3. 24= pop average test score for class 4.

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