Examlex
Which factor most motivated people to settle in the US between 1820 and 1920?
Investigation
The systematic inquiry or examination into something to discover facts, establish evidence, or reach new conclusions.
Factorial Designs
Experimental setups that allow researchers to examine the effects of two or more independent variables simultaneously on a dependent variable.
Independent Variables
The variables manipulated or changed in an experiment to explore their effects on the dependent variable.
Interactive Effects
The combined effects of two or more independent variables on a dependent variable that are not simply additive.