According to recent research (Johnson et al., 2000), an increased risk of developing anxiety disorders was found among teenagers who
a. smoked marijuana.
b. smoked cigarettes.
c. drank alcohol
d. used steroids.
b
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Erikson's psychosocial theory of development proposes how many distinct stages that take place across the lifespan?
A. two B. three C. eight D. nine
Humans see different colors because we have different ______.
A. forms of rhodopsin B. forms of iodopsin C. shapes of cones D. shapes of rods
Direct observation and indirect methods of functional assessment are used to:
a. develop a hypothesis about antecedents and consequences of a behavior b. manipulate antecedents and consequences of a behavior c. gather information on the three-term contingency d. A and C
Whenever the F-ratio is near 1.00 it means that a. a mistake has been made in the computation
b. there are large systematic effects present. c. the experimental manipulation probably had the predicted effects. d. the between-groups variation is no larger than would be expected by chance alone and no larger than the within-groups variance.