Scientists monitored workers at two industrial sites for 20 years. The workers at the two sites had the same age distribution.
| Site | Mean annual exposure to ionising radiation / mSv | Workers who smoked / % | New cancer diagnoses per 100000 workers in the final year |
|---|---|---|---|
| R | 1.0 | 11 | 130 |
| S | 3.0 | 25 | 250 |
A researcher concludes that the higher radiation exposure at site S caused all the additional cancer cases. The researcher predicts that reducing the exposure at site S to 1.0 mSv will reduce its cancer rate to 130 per 100000 workers in the following year.
Evaluate the researcher's conclusion and prediction.
102 exam-style questions on Edexcel GCSE Biology 5.4 Non-communicable diseases, covering 5.4.1 Interaction of factors in non-communicable disease, 5.4.2 Lifestyle factors and non-communicable disease, and 5.4.3 Treatments for cardiovascular disease. Each one has a worked solution and a mark scheme showing where the marks go.