The following table lists battery life (in hours of continuous usage) and prices (in US dollars) for different smartphone models.

Use the rank correlation coefficient (Spearman’s $\rho$) to test the hypothesis of a correlation between battery life and price. Use $\alpha =0.05$. What conclusion can you draw?

• A. There is no significant correlation between battery life and price.
• B. There is a significant negative correlation between battery life and price.
• C. The sample size is too small to draw any conclusions.
• D. There is a significant positive correlation between battery life and price.

Answer: (D)