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Unformatted text preview: MAT 3378 3X - Spring 2010 Assignment 3 : Deadline: Friday, July 9 (In Class) Question 1: A research laboratory was developing a new compound for the relief of severe cases of hay fever. In an experiment with 36 volunteers, the amounts of the two active ingredients (factors A and B) in the compound were varied at three levels each. Randomization was used in assigning four volunteers to each of the nine treatments. The data on hours of relief follow. The data is found in the tab delimited file: hayfever.txt . The columns are respectively: hours of relief, Factor A (ingredient 1), Factor B (ingredient 2). The codes in the case of both factors represent: 1=low, 2=medium, 3=high. 1. Write down the two-factor ANOVA model to represent these data. 2. Fit the model and produce a QQ-plot of the residuals. Does the normality assumption appear to be reasonable here? 3. Produce a scatter plot of the residuals against the fitted values. Compare the within treatment variability. Does the variance constancy assumptionthe within treatment variability....
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- Spring '11