Independent and Dependent Variables

The video introduces independent and dependent variables. An independent variable (manipulated variable) stands alone, is not changed by other variables, and is the one being altered. A dependent variable (responding variable) depends on the independent variable and is the one being measured.

An example is given: investigating if car color impacts inside temperature. The color of the car is the independent variable because it is chosen and doesn't change. The change in inside temperature is the dependent variable as it is measured and varies based on car color.

Another example illustrates that the height of a tree depends on the amount of water it receives. The amount of water is the independent variable, and the height of the tree is the dependent variable, as it is measured and relies on the water quantity.

A third example shows how eating bananas affects blood pressure. The number of bananas eaten per week is the independent variable because it is changed, and the blood pressure is the dependent variable, as it is measured in response to banana consumption.

To remember which axis independent and dependent variables go on when graphing, the acronym DRY MIX is introduced. DRY stands for Dependent, Responding, Y-axis. MIX stands for Manipulated, Independent, X-axis, helping to correctly place variables on a graph.