The crime is murder in these novels, and the plots include accessories such as floor plans, maps, and railway timetables. The appeal of Golden Age fiction is the challenge of the intellectual game.
exogenous variables. (mathematics). In a mathematical model, the independent variables, which are predetermined and given outside the model. 1  Facebook. 2  Twitter.
The independent variable is the variable that is manipulated by the researcher during an experiment. In this case, the independent variable is the vitamin substance that is being given to the plant. This is controlled by the experimenting scientist. The dependent variable is the amount of plant growth.