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.
Your independent variable is the liquid, dependent variable is time taken to boil, and if you're not changing anything else...such as temperature, pot etc...all those are control variables. Reason being, the time taken to reach boiling temperature is dependent upon the liquid being tested.