Six-month-old Eva drops her teething ring in a fairly rigid way, simply letting go and watching it with interest. This example demonstrates Piaget's belief that, at first, schemes are

Sara was informed by her physician that she is not ovulating properly. Which of the following is her physician's most likely course of treatment?

Fertility drugs Eliminating nutritional deficiencies Increasing herbal consumption Decreasing stress and increasing caffeine intake

In drug studies that use placebo control groups, researchers often keep the administration of the actual treatment hidden from both the experimenter and the subject. This control strategy is referred to as a

a. Hawthorne effect. b. double-blind procedure. c. factorial design. d. multiple regression technique.