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 34 38 64 30 34 50 44 51 39 35 42 48 28 47 63 31 42 53 17 34 48 31 43 58 20 57 47   47 51   44 51   54     Compute the 95% confidence intervals that estimate the difference between each pair of means. (Negative amount should be indicated by a minus sign. Round your answers to 2 decimal places.)

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