In a local community, a random sample of 18 couples has been assessed on a scale that measures the extent to which power and decision making are shared (lower scores) or monopolized by one party (higher scores) and on marital happiness (higher scores indicate higher levels of happiness). The couples were also classified by type of relationship: traditional (only the husband works outside the home), dual-career (both parties work), and cohabitational (parties living together but not legally married, regardless of work patterns). Does decision making or happiness vary significantly by type of relationship? a. Decision making Traditional Dual-Career Cohabitational 7 8 2 8 5 1 2 4 3 5 4 4 7 5 1 6 5 2 find the grand mean. sst, ssb, ssw, and the f ratio