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

Question

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.

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.)

Find the values of mean and standard deviation. (Round the mean and standard deviation values to 3 decimal places.)

References

Worksheet

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.

Explanation / Answer

1) applying one way ANOVA from excel data analysis:

b)

3)

The hypothesis of identical means can definitely be rejected

There is  difference in the mean attention span.

4)

Clothes have a mean attention span of at least ten minutes belowthe other groups.

Source of Variation df SS MS F P-value factors 2.00 3172.78 1586.39 26.92 0.0000 error 29.00 1709.10 58.93 Total 31.00 4881.88

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