Which of the following are the trial courts of the federal court system?

Which word best describes the constitutional provisions relating to the powers of the president?

a. exact b. static c. deferential d. vague

A visitor to Earth from another planet noticed that people started to buy lighter clothing such as t-shirts and sandals. A few weeks later, the temperature increased. The visitor concluded that the shopping caused the change of weather. This error is called

a. Reverse causation b. Common cause c. Sample selection bias d. All of the above