A new drug for hay fever was tested on 800 patients. The table shows the results of the trial.
Table: The percentage of patients whose hay fever symptoms improved when given a new drug or a placebo
| Group | Number of patients | Percentage of patients whose symptoms improved (%) |
|---|---|---|
| Given the new drug | 400 | 62 |
| Given a placebo | 400 | 47 |
Which statement is the best conclusion from these data?
The drug had no effect, because patients given the placebo also improved
The drug had an effect, because nearly half of the placebo group improved
The drug had no effect, because fewer than 7 in 10 patients given it improved
The drug had an effect, because more patients improved than with the placebo
176 exam-style questions on AQA GCSE Biology 3.1 Communicable diseases, covering 3.1.1 Communicable (infectious) diseases, 3.1.2 Viral diseases, 3.1.3 Bacterial diseases, 3.1.4 Fungal diseases, 3.1.5 Protist diseases, 3.1.6 Human defence systems, 3.1.7 Vaccination, 3.1.8 Antibiotics and painkillers, and 3.1.9 Discovery and development of drugs. Each one has a worked solution and a mark scheme showing where the marks go.