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

A study of the effect of television commercials on 12-year-old children measured their attention span, in seconds. The commer
1. Complete the ANOVA table. Use 0.05 significance level (Round the SS and MS values to 1 decimal place and Fvalue to 2 decim
3. Is there a difference in the mean attention span of the children for the various commercials? The hypothesis of identical
3. Is there a difference in the mean attention span of the children for the various commercials? The hypothesis of identical
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Answer #1

1)

ANOVA
Source of Variation SS df MS F P-value
Between Groups 3307.9 2 1654.0 40.69 0.0000
Within Groups 1178.8 29 40.6
Total 4486.7 31

2)

Groups n mean std dev
clothes 9 26.444 5.833
food 12 44.417 7.229
toys 11 51.818 5.759

3)

rejected,

a difference

4)

below

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