Which of the following theories of dreaming emphasizes that dreams are a meaningful product of our cognitive capacities, which shape what we dream about?

Lack of sleep is associated with

A) greater levels of depression and anxiety. B) better grades in school. C) faster cognitive and motor reactions. D) decreased risk of accidents.

A study involving the effect of physical activity on self-esteem has a p-value of .001 and has correctly ruled out all obvious alternative hypotheses. However, this study cannot be applied to any real-life settings. Thus it can be said to have __________

a. low internal validity, high external validity b. low internal validity, low external validity c. high internal validity, low external validity d. low construct validity, high convergent validity