1. A researcher randomly measures social adjustment among children from different family backgrounds (levels of Factor A: divorced, married, single) who engaged in one of five social activities (Factor B). For this study, 11 children were observed in each group. If SSA = 13, MSB = 9, SSAxB = 43, and SSWG = 413, then which effect was significant at a .05 level using the two-way between-subjects ANOVA?