An environmental researcher conducted an observational study at a regional organic food market to investigate consumer shopping bag usage and to see if the type of bag used differed between age groups. The researcher observed shoppers at the main exit and recorded whether they packed their purchases in reusable canvas bags or single-use plastic bags.
The collected observational data is shown in the table below.
| Age Group | Reusable Canvas Bag | Single-use Plastic Bag |
|---|---|---|
| Under 30s | 36 | 84 |
| 30 and over | 79 | 51 |
Calculate the overall percentage of observed shoppers who were using a reusable canvas bag. Show your workings.
513 exam-style questions on OCR A Level Psychology Data recording, analysis and presentation. Each one has a worked solution and a mark scheme showing where the marks go.