Researchers investigated whether there is an association between a person's age group and their primary source of news. They surveyed 460 adults, categorising them into three age groups and asking them to select their single main news source from four options. The contingency table below displays the results:
| Social Media | News Websites | Television | Podcasts | |
|---|---|---|---|---|
| Young Adults (18–29) | 75 | 35 | 12 | 28 |
| Middle-aged (30–50) | 42 | 58 | 31 | 39 |
| Older Adults (Over 50) | 15 | 45 | 65 | 15 |
Once the 'degrees of freedom' (df) has been calculated for this statistical test, outline how it is used to determine whether the association between age group and primary news source is statistically significant.
