Question

In a market research study, members of a consumer test panel are asked to rate the...

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 and/or by surface type?

  Mean Ratings of Dashboard Surface Texture

  Age Group Shiny Satin Pebbled Pattern
  Youth (under 21) 6.6        6.7        5.6        4.6       
  Adult (21 to 39) 5.3        5.8        6.0        5.6       
  Middle-Age (40 to 61) 4.2        5.5        6.0        5.5       
  Senior (62 and over) 3.7        4.0        6.1       

4.1   

(b) Fill in the missing data. (Round your SS values to 3 decimal places, F values to 2 decimal places, and other answers to 4 decimal places.)

   

Table of Means
Mean n Std. Dev
    Shiny                   
    Satin                   
    Pebbled                   
    Pattern                   
    Youth (Under 21)                   
    Adult (21 to 39)                   
    Middle-Age (40 to 61)                   
    Senior (62 and over)                   
    Total                   
ANOVA Table
  Source SS df MS F p-value
  Rows (Age Group)               
  Columns (Surface)               
  Error         
  Total      

Homework Answers

Answer #1

applying one way ANOVA on above data:

SUMMARY mean n std dev
Shiny 4.95 4 1.2871
Satin 5.5 4 1.1225
Pebbled 5.925 4 0.2217
Pattern 4.95 4 0.7234
  Youth (under 21) 5.875 4 0.9845
  Adult (21 to 39) 5.675 4 0.2986
  Middle-Age (40 to 61) 5.3 4 0.7703
  Senior (62 and over) 4.475 4 1.0966
Source of Variation SS df MS F P-value
Rows 4.592 3 1.5306 2.34 0.1411
Columns 2.687 3 0.8956 1.37 0.3126
Error 5.876 9 0.6528
Total 13.154 15
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