Table 1 shows the number of downloads of a new mindfulness app, 'ZenZone', before and after a high-profile influencer social media campaign.
| Under 25s | 25 and Over | |
|---|---|---|
| Before the campaign | 1850 | 2950 |
| After the campaign | 3420 | 2610 |
Calculate the percentage increase in downloads of ZenZone for the Under 25s group. Give your answer to two significant figures.
Show your workings.
235 exam-style questions on AQA A Level Psychology Data handling and analysis. Each one has a worked solution and a mark scheme showing where the marks go.