Valid - Described an experimental procedure where only one variable (the independent variable) is changed and all other variables are controlled., Reliable - A set of repeated measurements that are similar., Precission - How fine a scale the measuring instrument has. , Accuracy - How closely the measured or calculated value matches the true value., Independent variable - Variable that is actively changed during the experiment., Dependent variable - Variable that is measured and may changed in response to a change in the IV., Controlled variables - Variables that are kept the same during the experiment.,

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