You decide these values at the planning stage of your investigation.
  • Dependent variable only
  • Control variables only
  • Dependent and control variables
  • Key independent variable and control variables
The key variable is...
  • the variable that is changed by the experimenter
  • the variable that is controlled by the environment of the experiment
  • the variable that is measured by the experimenter
  • the variable that is always decreased in value
In graphs, the key variable is always plotted on the...
  • x axis
  • y axis
  • both axes
  • does not matter
I think that as the mass increases, the speed will decrease. Which is the key variable?
  • Mass
  • Speed
  • Increase
  • Decrease
If we change the value of a factor affecting the experiment, it must be the ...
  • key variable
  • a controlled variable
  • dependent variable
  • an anomaly
I think that as we increase the temperature, the number of germinating seeds will increase. The dependent variable is ...
  • temperature
  • number of seeds
  • increase
  • decrease
A variable in an experiment is...
  • a factor we can change or measure or control
  • a factor in the environment
  • something which changes
  • something which stays the same
The key variable is the factor we are...
  • changing
  • keeping constant
  • ignoring
  • measuring
Controlled variables are always kept...
  • the same
  • different
  • larger
  • smaller
Uncontrolled variables may make the results...
  • unreal
  • accurate
  • unreliable
  • true
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