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.

g$.$ 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.$)$

Please use Excel, Data Analysis or MegaStat