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Edexcel Biology unit 3B HELP??!!!!!!

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Hey guys,

I would really appreciate if you could help; lately I've been doing Bio unit 3B past papers and there are an awful lot of questions about stating the reliability of your results based on the graph. In the marking scheme it usually includes stuff like Standard Deviation, error bars, overlapping, anomalies etc... How do you comment on the reliability with this information though? Please help, I will really appreciate it
 
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If Standard Deviation is less, the data is more reliable.
If the error bars overlap, reliability is less.
If there is no anomalous value, the data is more reliable.
Hope this helps.
 
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