What percentage of men report having difficulty achieving or maintaining an erection by age 60?

Based on animal models, there is evidence that cocaine abusers have malformed dendrites and disrupted functioning in the ___, which impairs judgment and decision making

a. Nucleus amygdala b. Nucleus accumbens c. Hippocampus d. Prefrontal cortex

A research finding is especially hard to replicate under which of these conditions?

a. If the finding is statistically significant b. If attempts to replicate use exactly the same procedure as the original study c. If attempts to replicate use few participants or imprecise measurements d. If attempts to replicate use more precise measurements than the original study