25.1) The ANOVA table below is the result of a skin scratch-test for high school students grouped according to blood typ

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25.1) The ANOVA table below is the result of a skin scratch-test for high school students grouped according to blood type and social-economic backgrounds. The mean area of skin reactivity for each population measured in mm². Answer the following questions based on the assumption that all preliminary checks for the ANOVA test passed. Use a 2% LOS. ANOVA TABLE Degrees of Mean Squares freedom: (df) (MS) Sum of Squares (SS) F-sample 317.3 7 45.33 4.317 Source Between Groups Within Groups Total 210 20 10.5 527.3 27

25.1a) How many groups were used in the ANOVA skin reactivity experiment? Number of groups = 25.1b) How many observations were used in the ANOVA skin reactivity experiment? Number of observations =

25.1c) Write a statistical conclusion for the ANOVA hypothesis. At the 2% LOS we Reject the null hypothesis of H., because: df = (dfb, dfw) = ( df and F Notation Support: Fsample > ✓ Fcritical Numeric Validation: p-Notational Support: р < να p= (0.001 < p <0.01) < Numeric Validation: < ✓ 0.02

25.1d) Write an English sentence conclusión. The evidence supports the case that mean area of skin reactivity in mm of high school students varies according to their respective blood type and social economic populations. 25.10) Suppose all the standard deviations of the data set above were pooled. What is this value? Spooled =