The multiple correlation coefficient of a criterion variable with two predictor variables
A) is usually smaller than the sum of the correlation coefficients of the criterion variable with each predictor variable.
B) is usually larger than the sum of the correlation coefficients of the criterion variable with each predictor variable.
C) is exactly the same as the sum of the correlation coefficients of the criterion variable with each predictor variable.
D) can be larger, smaller, or the same as the sum of the correlation coefficients of the criterion variable with each predictor variable.
A
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In the case of Richard, the patient with OCD described in the textbook, he was compelled to take very small steps as he walked and to look back repeatedly. As with other types of checking compulsions, Richard was trying to
A. restore a sense of safety and control. B. reduce the possibility of contamination. C. ward off an imagined disaster. D. make sure he didn't make a mistake.
Which of the following is a disadvantage of the longitudinal design?
a) Individuals of different ages are being compared to one another. b) Longitudinal samples are rarely representative. c) Longitudinal studies fail to track changes over time. d) Participants may drop out due to moving, loss of interest, or changes in attitude.
Piaget's theory is described as a constructivist approach because he
A) stressed the social and cultural contributions to children's thinking. B) viewed children as discovering virtually all knowledge about their world through their own activity. C) emphasized how genetic and environmental factors combine to yield more complex ways of thinking. D) believed that children construct knowledge through adult training and modeling.
The name of the eating disorder in which the primary symptom is that the person is obsessed by thoughts of an unattainable image of "perfect" thinness is:
a. bulimia nervosa b. anorexia nervosa c. obsessive-compulsive disorder d. gordophobia