Median real estate property taxes paid for housing units with mortgages in 2013: $590 (1.2%). Median real estate property taxes paid for housing units with no mortgage in 2013: $637 (1.5%). Nearest city with pop. 50,000+: Bismarck, ND (78.6 miles, pop. 55,532). Nearest city with pop. 200,000+: Minneapolis, MN (305.7 miles, pop. 382,618).
The third type of variable is a controlled variable. This variable is constant in an experiment. Experiments are repeated a number of times to interpret how a change in the independent variable affects each trial result.
Variables: Independent, Dependent, Controlled. Types of Variables in A Science Fair Project. A variable is part of an experiment that can change, such as amount of light, temperature, humidity, time changes, or plant growth. In an experiment, an independent variable is a variable that either changes on its own, or you purposely change it. The goal of an experimental investigation is to determine how changes in an independent variable affects another variable, which is called the dependent variable.