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• You must produce a scatter graph of your experimental data.
• If you carried out two experiments, you should include scatter graphs of your data from both experiments. In this case, both graphs will be marked, and you will be awarded the mark for the better of your graphs.
• You must use graph paper or graphing software. If you are using graphing software, include both major and minor gridlines, and use plotting symbols which are clear but not too large.
• A line or curve of best fit should usually be drawn. However, if there is no obvious pattern to your plotted data points, you should not try to draw a line or curve of best fit.
• The graph(s) must be large enough to allow points to be read accurately and have suitable scales. It/they must also have labels and units on the axes.

Uncertainties

• You must include scale reading uncertainties for all the measurements you have made in your experiment, and calculate the random uncertainty in your repeated measurements.
• If you carried out two experiments, you should include the uncertainties in the measurements from both experiments. Both sets of uncertainties will be marked, and you will be awarded the mark for the better set.

Data from an internet/literature source or second experiment

• If you carried out a single experiment, you must include data from an internet/literature source that is relevant to your experimental data.
• If you carried out two experiments, you must include the data from your second experiment.

Citation and reference for a source of data/information from the internet/literature

You must include a reference to a source of data/information.

• If you carried out a single experiment, your reference must be to the source of data obtained from the internet/literature which is relevant to your experimental data.
• If you carried out two experiments, your reference must be to a source of information gathered to support your description of the underlying physics.
• You must cite the internet/literature source within the body of the report, near to the relevant data/information, with the reference listed later in the report.
• If you carried out a single experiment and have included data from an internet/literature source in your report, you must cite this source next to the data.
• If you carried out two experiments, you must cite your source(s) of the information that supports your description of the underlying physics. This must be cited next to the information.
• You can cite a source in many ways. One way is to put a number, for example (1), next to the data/information and the same number beside the reference included later in the report.

You must include the following information in the reference: