15. Calculate coefficient of correlation from following data(step deviation method) & 12 & 15 & 18 & 21 & 24 & 27 & 30 & 6 & 8 & 10 & 12 & 14 & 16 & 18

Question

15. Calculate coefficient of correlation from following data(step deviation method): 6 \begin{tabular}{|l|l|l|l|l|l|l|l|} \hline \( X \) & 12 & 15 & 18 & 21 & 24 & 27 & 30 \\ \hline \( Y \) & 6 & 8 & 10 & 12 & 14 & 16 & 18 \\ \hline \end{tabular}