Patients in a medicine trial are randomly allocated to receive either the medicine or an identical-looking placebo. Neither the patients nor the researchers recording the results know which treatment each patient receives.
Which statement explains the purpose of keeping this information hidden?
It prevents effects of natural recovery and patient age on recorded results.
It removes effects of dose differences and treatment duration on recorded results.
It reduces effects of patient expectations and researcher bias on recorded results.
It eliminates effects of side effects and allergic reactions on recorded results.
45 exam-style questions on Edexcel GCSE Biology 5.3 Immune system and medicines, covering 5.3.1 The specific immune system, 5.3.2 Response to immunisation, 5.3.3 Advantages and disadvantages of immunisation, 5.3.4 Antibiotics and bacterial infections, 5.3.5 Aseptic techniques in culturing, 5.3.6 Cross-sectional areas of cultures, 5.3.7 Stages of developing new medicines, and 5.3.8 Production of monoclonal antibodies. Each one has a worked solution and a mark scheme showing where the marks go.