When health psychologists study variables that cannot be manipulated, they often conduct a:

A psychodynamic theorist would explain anxiety or depression in terms of hidden, or unconscious, thoughts, needs, and emotions

Indicate whether this statement is true or false.

What was the most significant psychometric problem of the 1937 Stanford-Binet Scale?

a. differential variability of IQ scores as a function of age b. narrower age range c. more problematic scoring standards and instructions d. poor predictive validity