Which of the following is NOT a behavioral variable?

A researcher studies the relationship between political attitudes and income. The researcher finds that those with higher income are more conservative. The most likely confounding variable is

A) Income. B) Age. C) Weight. D) Health status.

The president enters the "zone of twilight" described in the Supreme Court's Youngstown decision when he or she __________

A)fails to act with the explicit authorization of Congress B)acts with the explicit authorization of Congress C)acts without explicit congressional authorization D)refuses to act without explicit congressional authorization