A four-factor ANOVA experiment was carried out to investigate the effects of fabric (A), type of exposure (B), level of exposure (C), and fabric direction (D) on extent of color change in exposed fabric as measured by a spectrocolorimeter. Two observations were made for each of the three fabrics, two types, three levels, and two (“Accelerated Weathering of Marine Fabrics,” J. Testing and Eval., 1992: 139–143). Assuming fixed effects for all factors, carry out an analysis of variance using α = 0.1 for all tests and summarize your conclusions.
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