Two community health services kept records for one year.
| Contraceptive method | Number of users | Number becoming pregnant |
|---|---|---|
| Contraceptive injection | 600 | 18 |
| Diaphragm | 250 | 20 |
A researcher estimates how many pregnancies would occur if 1000 people used each method for one year. Assume that each pregnancy rate remains unchanged.
| Row | Contraceptive injection | Diaphragm |
|---|---|---|
| W | 18 | 20 |
| X | 3 | 8 |
| Y | 30 | 80 |
| Z | 80 | 30 |
Which row gives the expected numbers of pregnancies?
Row X.
Row Z.
Row W.
Row Y.
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.