AMO 2027 Grades 4-5 SET 9 - Self-study Question 6

The table shows the results of a research study that investigated the therapeutic value of vitamin C in preventing colds. A random sample of 300 adults received either a vitamin C pill or a sugar pill each day during a 2-week period, and the adults reported whether they contracted a cold during that time period. What proportion of adults who received a sugar pill reported contracting a cold?

Number of Adults Contracting Colds

| Group | Cold | No cold | Total |
|---|---:|---:|---:|
| Vitamin C | 21 | 129 | 150 |
| Sugar pill | 33 | 117 | 150 |
| Total | 54 | 246 | 300 |