Which of the following is a medical complication related to bulimia nervosa?

What is the difference between main effect and interaction effect?

a. Main effect is the effect of one factor, ignoring the other while interaction effect is the effect of one factor varying depending on the level of the other factor b. Interaction effect is the effect of one factor varying depending on the level of the other factor while main effect is the effect of one factor, ignoring the other c. There is no difference d. Both A & B are correct

Chase and Simon's research compared memory of chess masters and beginners for the position of game pieces on sample chess boards. They found that the chess master remembered positions better when the arrangement of the pieces was consistent with a real game but not when the pieces were randomly placed. The significance of this finding was that

a. experts show larger primacy and recency effects than beginners. b. knowledge in an area of expertise increases a person's digit span. c. expertise with some material reduces susceptibility to proactive interference with that material. d. chunking requires knowledge of familiar patterns or concepts