Scientists investigated whether long-term exposure to ionising radiation was associated with cancer. They recorded the number of people who developed cancer in two groups, each containing 1000 people.
| Group | Number who developed cancer |
|---|---|
| Exposed to ionising radiation | 30 |
| Not exposed to ionising radiation | 10 |
A student concludes that exposure to ionising radiation is a risk factor for cancer. Use the data to justify this conclusion.
The student then says, “Everyone exposed to ionising radiation will develop cancer.” Evaluate this statement using the data.
304 exam-style questions on AQA GCSE Biology 2.2 Animal tissues, organs and organ systems, covering 2.2.1 The human digestive system, 2.2.2 The heart and blood vessels, 2.2.3 Blood, 2.2.4 Coronary heart disease: a non-communicable disease, 2.2.5 Health issues, 2.2.6 The effect of lifestyle on some non-communicable diseases, and 2.2.7 Cancer. Each one has a worked solution and a mark scheme showing where the marks go.