Among adults ages 75-84 in the United States, roughly what percent live with their spouse?

Which of the following statements about diets and dieters is true?

A) About one-third of Americans on weight-reduction diets are within their normal weight range. B) Diet programs utilizing group counseling are less effective than programs with individual counseling. C) Most dieters lose weight and maintain their weight loss for five or more years. D) Repeat dieters are more likely than weight-loss maintainers to confront problems directly.

What is a problematic aspect of using a subject variable as the independent variable in an experiment?

A) Subject variables are inherent to the individual subject of the experiment B) Subject variables are randomly assigned in experimental design C) Subject variables may systematically related to other subject variables D) Subject variables vary from situation to situation