Which psychic structure is motivating behavior when you decide to stay home and study for a test, rather than go to a party you would really like to attend?

Advanced topic: In a two-way analysis of variance, the degrees of freedom for each main effect are

A) the number of cells minus the number of variables. B) the number of variables minus the total scores within the column or row. C) the number of levels of the variable minus 1. D) the total number of scores in that row or column minus 2.

Marsha lets out blood-curdling screams in the middle of the night, sits up in bed, and is seemingly inconsolable by her parents. In the morning, she doesn't remember having behaved this way. Marsha is most likely suffering from ____

a. ?nightmares b. ?sleep terror disorder c. ?REM behavior disorder d. ?sleep walking