In the cross-cultural investigation of helping behaviour by Levine et al. (2001), researchers analyzed the relationship between various community-level variables and overall helping rates. Which of the following best describes the correlation found between a city's economic productivity (measured by Purchasing Power Parity, or PPP) and the overall level of help offered?
A significant positive correlation, indicating that wealthier cities were significantly more helpful.
A non-significant negative correlation, indicating that wealthier cities tended to be less helpful, but this was not statistically reliable.
A significant negative correlation, indicating that cities with lower economic productivity (poorer cities) were significantly more helpful.
A non-significant positive correlation, indicating that wealthier cities tended to be more helpful, but this was not statistically reliable.
