OCR A biology AS level help

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ac_ccident
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i just had the ocr as biology exam yesterday and one of the questions included a table of the concentrations of 2 test tubes named P and Q. the question asked how to calculate if there is a significance difference between the two and i know that its students t test but there was an option for paired student t test or unpaired t test. anyone know how the type of t test can be identified???
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