Researchers hypothesized that stress was a risk factor for depression among college students. the correlation between stress and depression that they found in their cross-sectional study was consistent with the hypothesis. which is a possible threat to the internal validity of this study?

Which statement is a good description of a model? a) models are a description of nature based only on one or two variables. b) models are testable ideas but they are not very to most people. c) models are a description of nature that predicts more accurately than real events. d) models are an approximiation of a real system that omits all but most essential variables in a system.

What were the anti-federalists against? a. the views of patrick henry b. ratification of the constitution without a bill of rights c. the declaration of independence from great britain d. a weak central government

True or false: the eastern roman empire lasted for 1,000 years longer than the western roman empire.