What type of research compares naturally formed or preexisting groups rather than employing random assignment to conditions?

The united states constitution gives the the power to regulate interstate commerce.

What does it signify if point 1 shifts down and to the right? a. the price level and the real gdp are falling. b. the real gdp is falling, and supply is increasing. c. the price level is rising, and production is increasing. d. the price level is falling, and demand and the real gdp are rising.

Values, conventions, clothing, and behaviors are part of a group's: