Of those Americans exposed to a severely traumatic event at some time in their lives, about ______ percent will develop symptoms of posttraumatic stress disorder

Which of the following statements about menopause is true?

a. Most women find that their menstrual cycles stop abruptly. b. Hormone levels increase, causing disruption in the menstrual cycle. c. The ovaries produce lower levels of hormones as women age. d. The endometrial lining is no longer capable of receiving eggs.

The use of modeling is more likely to be effective when the:

a. model's behavior is reinforced b. the model is dissimilar to the learner c. model has low status d. all of these