Devising a practical

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4 Terms

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How to write a practical answer

  1. 1-2 bullet points describing how to change the independent variable

  2. 1-2 bullet points describing how to measure the dependent variable

  3. State 2-3 controlled variables ( include at one related to the organism and one abiotic factor)

  4. Describe a control as a suitable control within the independent variable

  5. Repeat a minimum of 3 times and calculate a mean and do a stats test

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Top tips for writing practicals

→ Never say amount

→ Be specific with independent variable where possible , state at least 5

→ Always repeats

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Control

Used as a standard of comparison for checking the results of an experiment i.e. check that it is really the independent variable causing a change in the DV

It increases validity

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Controlled variable

Something that is kept constant and unchanged in an experiment