Scientists recorded the mean body mass index (BMI) of adults and the percentage of adults with type 2 diabetes in 20 countries.
A scatter diagram of the data shows a positive correlation, but a few countries do not fit the trend.
Which statement is the best evaluation of this evidence?
A high BMI causes type 2 diabetes, because the correlation is positive.
BMI has no link with type 2 diabetes, as some countries do not fit.
A low BMI prevents type 2 diabetes, because some countries have low rates.
BMI is linked to type 2 diabetes, but other factors may also be involved.
181 exam-style questions on OCR GCSE Biology 6.3 Monitoring and maintaining health, covering 6.3.1 Health and disease, 6.3.2 Interactions between diseases, 6.3.3 Spread of communicable diseases, 6.3.4 Common infections and diseases, 6.3.5 Physical plant defence responses, 6.3.6 Chemical plant defence responses, 6.3.7 Detecting and identifying plant diseases, 6.3.8 White blood cells and platelets, 6.3.9 Non-specific defence systems, 6.3.10 The immune system, 6.3.11 Monoclonal antibodies, 6.3.12 Vaccines and medicines, 6.3.13 Aseptic techniques, 6.3.14 Discovery and development of new medicines, 6.3.15 Causes of non-communicable diseases, 6.3.16 Treatments for cardiovascular disease, 6.3.17 Lifestyle factors and non-communicable diseases, 6.3.18 Cancer, 6.3.19 Stem cells in medicine, 6.3.20 Gene technology in medicine, and 6.3.21 The human genome and medicine. Each one has a worked solution and a mark scheme showing where the marks go.