A research team compares a contraceptive injection with a diaphragm. Sixty people use the injection for one year, and 120 people use the diaphragm for six months. Three pregnancies occur in each group.
The researchers want to compare the effectiveness of the two methods. Which statement identifies the fairest way to report the results?
Report the percentage of users who became pregnant over the same length of time for each method.
Report the percentage of users who became pregnant over each method's stated period.
Report the number of users who did not become pregnant after each method's stated period.
Report the total of three pregnancies for each method as the comparison.
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.