a factorial experiment involving two levels of factor a and three levels of factor b resulted in the following data. factor b level 1 level 2 level 3 level 1 135 90 95 175 86 103 factor a level 2 105 117 140 115 125 126 test for any significant main effects and any interaction. use . round sum of squares to the whole number, value, mean square to two decimals, if necessary, and -value to four decimals.