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. At the .05 significance level, is there a difference in the mean attention span of the children for the various commercials? Are there significant differences between pairs of means? Would you recommend dropping one of the three commercial types?

a. What are the null and alternate hypotheses?

b. Compute the ANOVA table.

c. What is the test statistic?

d. What is the p-value?

e. What is your decision regarding the null hypothesis?

f. Interpret the result.

g. Compute the 95% confidence intervals that estimate the difference between each pair of means.

h. Which pairs of means are statistically different?

Transcribed Image Text:

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 54