In a market research study, members of a consumer test panel are asked to rate the visual appeal (on a 1 to 10 scale) of the texture of dashboard plastic trim in a mockup of a new fuel cell car. The manufacturer is testing four finish textures. Panelists are assigned randomly to evaluate each texture. The test results are shown below. Each cell shows the average rating by panelists who evaluated each texture. Research question: Is mean rating affected by age group Texture and/or by surface type?

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Mean Ratings of Dashboard Surface Texture Age Group Shiny Satin Pebbled Pattern Youth (under 21) Adult (21 to 39) Middle-Age (40 to 61) Senior (62 and over) 6.7 5.5 4.5 3.9 6.6 5.3 5.5 6.2 6.7 6.1 4.3 5.9 5.5 4.5