Q9

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 testlng four nish 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 andlor by surface type? Mean mtg-la: of Dashboard Surface Textrre Age Group Shin Satin PebbLed Pattern Youth (under 21) 6.3 6.2 5.3 4.4 Adult (21 to 39) 5.1 5.2 6.4 5.9 Middle-Age (4a to 51) 4.8 5.1 5.1 5.1 Senior- (62 and over) 3.2 4.8 6.8 4.5 Which type of ANOVA model should be used? 0 One factor completely randomized 0 Two factor with replication 0 Two factor without replication Choose the correct row-effect hypotheses. 3. H0: A1 = A2 = A3 = 0 4: Age group means are the same H1: Not all the A}- are equal to zero