A study of the effect of television commercials on 12-year-old

A study of the effect of television commercials on 12-year-old children measured their attention span, in seconds. The commercials were for clothes, food, and toys.


Clothes Food Toys
23 32 57
24 44 47
29 40 43
35 49 52
28 47 63
31 42 53
17 34 48
31 43 58
20 57 47
47 51  
44 51  



  1. Complete the ANOVA table. Use 0.05 significance level. (Round the SS and MS values to 1 decimal place and F value to 2 decimal places. Leave no cells blank – be certain to enter “0” wherever required.)
  2. Find the values of mean and standard deviation. (Round the mean and standard deviation values to 2 decimal places.)
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