The effect of the experimenter varying the manipulated variable is measured as the responding variable (the part of the experiment under observation), this is always plotted on the vertical axis (y-axis or ordinate). These are the manipulated variables and always go on the horizontal axis (x-axis). In an experiment the experimenter will set up a set of conditions, it may be a range of temperatures or pH values, or, more common, the experimenter may choose to observe the experiment proceeding at set intervals of time (seconds, days or even years). Determine the manipulated and responding variables.
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