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
26 45 60
21 48 51
43 43 43
35 53 54
28 47 63
31 42 53
17 34 48
31 43 58
20 57 47
  47 51
  44 51

Complete the ANOVA table. Use .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. Round the DF values to nearest whole number.)

  Source DF SS MS F P
  Factors .
  There is  in the mean attention span.

(4) Are there significant differences between pairs of means?

  Clothes have a mean attention span of at least ten minutes 

 the other groups.















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