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==Key Stage 4==
===Meaning===
A '''double blind trial''' is a [[Clinical Trial|clinical trial]] where the [[doctor]] and the [[patient]] don't know if they have been given a real potential [[medicine]] or a [[placebo]].
===About Double Blind Trials===
: '''Double blind trials''' are used to prevent [[bias]] from affecting the results of a [[Clinical Trial|clinical trial]] when either the [[doctor]] or the [[patient]] expect the potential [[medicine]] to work or not.
: Many [[Alternative Medicine|alternative medicines]] appear to work until they are tested with a '''double blind trial''' showing that they are just a [[placebo]] and not a real [[medicine]].
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/0008158754/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158754&linkCode=as2&tag=nrjc-21&linkId=27ad53b0283feeff7fc5ae04a9e205f246 ''Double blind trial, page 156, GCSE Biology; Student Book, Collins, AQA '']
:[https://www.amazon.co.uk/gp/product/0198359373/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359373&linkCode=as2&tag=nrjc-21&linkId=952a73bbb09d222ecc4b50d200679849 ''Double blind trials, page 105, GCSE Biology; Third Edition, Oxford University Press, AQA '']
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/1782946381/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946381&linkCode=as2&tag=nrjc-21&linkId=5ec5fc3f6429e30c1d9ab9bca2bccf93 ''Double-blind trials, page 138, GCSE Combined Science Trilogy; Biology, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/1782945954/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945954&linkCode=as2&tag=nrjc-21&linkId=100574c08fbbb64318256eb79ed61a76 ''Double-blind trials, page 144, GCSE Biology, CGP, AQA '']
====OCR====
:[https://www.amazon.co.uk/gp/product/1782945695/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945695&linkCode=as2&tag=nrjc-21&linkId=ceafcc80bcad6b6754ee97a0c7ceea53 ''Double-blind trials, page 75, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR '']