6 Fig. 6 shows the wages earned in the last 12 months by each of a random sample of American males aged between 16 and 65 .
\begin{figure}[h]
\includegraphics[alt={},max width=\textwidth]{e6ee3a4a-3e76-4422-9a78-17b64b458f83-07_771_1278_340_392}
\captionsetup{labelformat=empty}
\caption{Fig. 6}
\end{figure}
A researcher wishes to test whether the sample provides evidence of a tendency for higher wages to be earned by older men in the age range 16 to 65 in America.
- The researcher needs to decide whether to use a test based on Pearson's product moment correlation coefficient or Spearman's rank correlation coefficient. Use the information in Fig. 6 to decide which test is more appropriate.
- Should it be a one-tail or a two-tail test? Justify your answer.