A person is choosing between a hormonal injection and a diaphragm. The injection releases hormone continuously for 12 weeks after it is given.
The table shows how the person used each method during separate 12-week periods.
| method | number of times an action was required | number of times the action was missed or completed incorrectly |
|---|---|---|
| hormonal injection | 1 | 0 |
| diaphragm | 48 | 5 |
Explain which method was less affected by forgetting and predict how this would affect the chance of pregnancy caused by missed or incorrect actions.
90 exam-style questions on Edexcel GCSE Biology 7.2 Reproductive hormones, covering 7.2.1 Stages of the menstrual cycle, 7.2.2 Hormonal control of the menstrual cycle, 7.2.3 Hormonal contraception, 7.2.4 Evaluating contraception methods, and 7.2.5 Hormones in Assisted Reproductive Technology. Each one has a worked solution and a mark scheme showing where the marks go.