An Experiment Was Conducted to See How People with Eating

Multiple Choice

An experiment was conducted to see how people with eating disorders differ in their need to exert control in different domains. Participants were classified as not having an eating disorder (control) , as having anorexia nervosa (anorexic) , or as having bulimia nervosa (bulimic) . Each participant underwent an experiment that indicated how much they felt the need to exert control in three domains: eating, friendships and the physical world (this final category was a control domain in which the need to have control over things like gravity or the weather was assessed) . So all participants gave three responses in the form of a mean reaction time; a low reaction time meant that the person did feel the need to exert control in that domain. The variables have been labelled as group (control, anorexic, or bulimic) and domain (food, friends, or physical laws) .
- Looking at the output below, what can we conclude about the main effect of the group variable?

A) People with eating disorders need to exert more control over different domains of their life, F(2, 27) = 0.93, p < .05.
B) People with eating disorders significantly differ in their need to exert control over food, F(2, 27) = 0.93, p > .05.
C) People with eating disorders need to exert significantly more control over different domains of their life than people without eating disorders, F(1, 27) = 2029.76, p < .001.
D) When ignoring the type of domain, people who differ with regard to eating disorders did not significantly differ in their need to exert control, F(2, 27) = 0.93, p = .405.