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. Ho: Average attention spans for Clothes, Food and Toys adverts are the same H1: Average attention spans for Food, Clothes and Toys are different Clothes 32 26 37 35 28 31 17 31 20 Total (a) 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.) Source Variance Between Groups Within Groups Level Clothes Food Food 48 24 33 58 47 42 34 43 57 47 44 54 Toys Toys 52 55 38 59 63 53 48 58 47 51 51 (b) Calculate 955 Confidence Intervals for the group means. See section 12.3.2 of the textbook for a reminder because the confidence intervals are based on the ANOVA table. (Round the mean and standard deviation values to 2 decimal places.) Mean Low Limit High Limit There is a ss DF V (c) Is there a difference in the mean attention span of the children for the various commercials? The hypothesis of identical means can definitely be F in the mean attention spans.