Experimenter variables are characteristics of the researcher that can influence the study outcomes, but are not typically used to measure manipulation in an experiment. Instead, manipulation is typically measured by the observed changes in the dependent variable(s) resulting from the experimental treatment or condition.
x is used a lot to represent an independent variable. When time is the independent variable t is often used as well.
In a position versus time graph, time is typically considered the independent variable because it is controlled by the experimenter and is used to measure the dependent variable, which is position. The position of an object (dependent variable) changes over time (independent variable), and thus position is plotted against time to show how it varies based on the passage of time.
The manipulated variable in an experiment with a water rocket could be the amount of water or air pressure used to launch the rocket. This variable is intentionally changed by the experimenter to observe its effect on the rocket's performance.
A constant is a variable that does not change in an experiment. It is used as a point of reference or comparison to measure the effects of other variables.
A control variable is a factor that remains constant and does not change during an experiment. It is used to ensure that any observed effects or changes are due to the manipulation of the independent variable and not other factors.
Each time the independent variable is changed, the dependent variable is measured. If the independent variable is time, the experimenter chooses an appropriate interval between measurements. This same methodology is used whenever the independent variable is not something the experimenter actually has in his control.
x is used a lot to represent an independent variable. When time is the independent variable t is often used as well.
In a position versus time graph, time is typically considered the independent variable because it is controlled by the experimenter and is used to measure the dependent variable, which is position. The position of an object (dependent variable) changes over time (independent variable), and thus position is plotted against time to show how it varies based on the passage of time.
The manipulated variable in an experiment with a water rocket could be the amount of water or air pressure used to launch the rocket. This variable is intentionally changed by the experimenter to observe its effect on the rocket's performance.
The independent variable in a rainbow fire experiment is typically the different chemical compounds or elements used to create the different colors of flames. It is the variable that is manipulated or changed by the experimenter to observe its effect on the outcome.
The independent variable of a homemade lava lamp experiment could be the type or amount of oil used, the type or amount of water used, or the type or amount of effervescent tablets used. This variable is manipulated by the experimenter to observe its effect on the outcome of the lava lamp's behavior.
experimenter
level of treatment
Operationalization
An independent variable is the variable of the experiment that the dependent variable depends on. For example, in an experiment testing the effects of soil quality on a plant's growth, the dependent variable would be the plant's growth and the independent variable would be the quality of the soil.
The independent variable in an experiment involving Alka-Seltzer could be the amount of Alka-Seltzer used, the temperature of the water it's dissolved in, or the surface area of the Alka-Seltzer tablet. It is the variable that is deliberately changed or manipulated by the experimenter to observe its effect on the dependent variable.
The manipulated variable, also known as the independent variable, is typically plotted along the x-axis of a graph. This variable is controlled by the experimenter and is used to observe its effect on the responding variable, which is usually plotted on the y-axis.