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The accuracy of a measurement is dependent on the quality of the measuring apparatus and the skill of the scientist involved.

For data to be considered reliable, repeats must be carried out.

Repeating a scientific investigation makes it more reliable.

Example

Practical 1.4 - Investigating the effect of temperature on the action of an enzyme

Accuracy can be improved by using a syringe to measure liquids rather than a measuring cylinder.

Reliability can be improved by completing each temperature more than once and calculating an average.